n = int(input("Enter the number of Fibonacci numbers: "))

a, b = 0, 1
count = 0

print("Fibonacci series:", end=" ")

while count < n:
    print(a, end=" ")
    c = a + b
    a = b
    b = c
    count += 1

print()

num = int(input("Enter a number: "))
reversed_num = 0

while num != 0:
    remainder = num % 10
    reversed_num = reversed_num * 10 + remainder
    num //= 10

print("Reversed number:", reversed_num)

n = int(input("Enter a number: "))

m = 1
while m < n:
    m *= 2
m -= 1

isMersennePrime = True
i = 2
while i * i <= m:
    if m % i == 0:
        isMersennePrime = False
        break
    i += 1

if isMersennePrime:
    print(m, "is a Mersenne prime number.")
else:
    print(m, "is not a Mersenne prime number.")

import math

a = float(input("Please enter the length of the first side: "))
b = float(input("Please enter the length of the second side: "))
c = float(input("Please enter the length of the third side: "))

# Check the triangle formation condition
if a <= 0 or b <= 0 or c <= 0 or a + b <= c or a + c <= b or b + c <= a:
    print("These three numbers cannot form the sides of a triangle.")
else:
    # Calculate the triangle area using the Heron's formula
    s = (a + b + c) / 2  # Semi-perimeter of the triangle
    area = math.sqrt(s * (s - a) * (s - b) * (s - c))  # Triangle area
    
    print("The area of the triangle with the given sides is: ", area)