import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long x = scanner.nextLong();
        System.out.println(2 * (x * x) - x);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long x = scanner.nextLong();
        System.out.println(x / 2 + 1);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.nextLine();
        char[] charArray = s.toCharArray();

        if (charArray.length > 1) {
            for (int i = 1; i < charArray.length; i += 2) {
                char temp = charArray[i - 1];
                charArray[i - 1] = charArray[i];
                charArray[i] = temp;
            }
        }

        StringBuilder r = new StringBuilder();
        for (char c : charArray) {
            r.append((char) (219 - (int) c));
        }
        System.out.println(r.toString());
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        double sum = scanner.nextDouble();
        double a = scanner.nextDouble();
        double b = scanner.nextDouble();
        if ((a % 0.5 == 0) && (b % 0.5 == 0) && (a + b == sum)) {
            System.out.println("YES");
        } else {
            System.out.println("NO");
        }
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long x = scanner.nextLong();
        System.out.println((x - 2) * 180);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int[] b = {0, 32, 40, 46, 25, 44, 41, 33, 43, 48, 22, 5, 25, 9, 18, 11};
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        System.out.println(b[x]);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long k = scanner.nextLong();
        int n = scanner.nextInt();
        StringBuilder result = new StringBuilder();
        if (k == 0) {
            result.append("0");
        }
        while (k > 0) {
            long remainder = k % n;
            char digit = (remainder < 10) ? (char) ('0' + remainder) : (char) ('A' + remainder - 10);
            result.insert(0, digit);
            k = k / n;
        }
        System.out.println(result);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String k = scanner.nextLine();
        k = new StringBuilder(k).reverse().toString();
        k = k.replace("hs", "sh").replace("hc", "ch").replace("gn", "ng");
        System.out.println(k);
    }
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long a = scanner.nextLong();
        long c = scanner.nextLong();
        long k = scanner.nextLong();
        long j = a / c;
        if (a - (j * c) >= k) {
            j += 1;
        }
        if (c <= k) {
            System.out.println(0);
        } else {
            System.out.println(j);
        }
    }
}

import java.util.Scanner;
import java.util.ArrayList;
import java.util.List;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        int c = scanner.nextInt();
        int d = scanner.nextInt();
        List<Integer> arr = new ArrayList<>();

        for (int i = a; i <= b; i++) {
            if (!arr.contains(i)) {
                arr.add(i);
            }
        }

        for (int y = c; y <= d; y++) {
            if (!arr.contains(y)) {
                arr.add(y);
            }
        }

        System.out.println(n - arr.size());
    }
}

n = int(input())
print(pow(2, n-1, 10**9+7))

from math import gcd
t=int(input())
res=[]
while t>0:
    t-=1
    a,b,c=map(int,input().split())
    a,b=min(a,b), max(a,b)
    if c<b and c%(gcd(a,b))==0:
        res.append('YES')
    else:
        res.append('NO')
for i in res:
    print(i)

#include <iostream>
#include <vector>
using namespace std;

int main() {
    int n;
    cin >> n;

    vector<vector<int>> matrix(2 * n - 1, vector<int>(2 * n - 1, 1));

    for (int i = 1; i < n; i++) {
        for (int j = i; j <= 2 * n - i - 2; j++) {
            matrix[i][j] = matrix[2 * n - i - 2][j] = matrix[j][i] = matrix[j][2 * n - i - 2] = i + 1;
        }
    }

    for (int i = 0; i < 2 * n - 1; i++) {
        for (int j = 0; j < 2 * n - 1; j++) {
            cout << matrix[i][j] << ' ';
        }
        cout << endl;
    }

    return 0;
}

n = int(input())
n = abs(n)
last_digit = n % 10
remaining = n // 10 - 2 * last_digit

if remaining % 7 == 0:
    print("YES")
else:
    print("NO")

n = int(input())
v = list(map(int, input().split()))
g = []
for i in range(3001):
    h = [0] * n
    g.append(h)

used = [False] * 3001
used[0] = True

for i in range(n):
    for j in range(1, 3001):
        if j - v[i] >= 0:
            if used[j - v[i]] and not used[j]:
                for ind in range(n):
                    g[j][ind] = g[j - v[i]][ind]
                g[j][i] += 1
                used[j] = True

q = int(input())
a = list(map(int, input().split()))
for i in range(q):
    for j in range(a[i], -1, -1):
        if used[j]:
            print(j)
            for ind in range(n):
                print(g[j][ind], end=" ")
            print()
            break

a = int(input())
b = int(input())

print(b-a+1)

n = int(input())
print((n*(n+1)*(n+2)*(n+3)//24)%(10**9+7))

for i in range(int(input())):
  k, q, n = map(int, input().split())
  if n==0:
    print(q)
  else:
    s = 0
    for j in range(n):
      c=2*(s+k)
      b=((2**n)*q) + c
      s = c
    print(b)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        long a = scanner.nextLong();
        long b = scanner.nextLong();
        long c = 0;
        if (a % b == 0) {
            System.out.println(a);
        } else {
            c = a / b;
            System.out.println(b * (c + 1));
        }
    }
}

var twoSum = function (nums, target) {
  let finalArr = [];
  for (let i = 0; i <= nums.length; i++) {
    for (let y = i + 1; y <= nums.length; y++) {
      if (nums[i] + nums[y] == target) {
        finalArr.push(i);
        finalArr.push(y);
      }
    }
  }
  return finalArr;
};