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#include<bits/stdc++.h>
using namespace std;

int ByServer(vector<int>& req) {
    int b = 0;
    for(int i = 0; i < req.size(); i += 2) {
        b += req[i];
    }
    return b;
}

int main() {
    int n;
    cin >> n;

    vector<int> a(n);
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }

    cout << ByServer(a) << endl;
    return 0;
}