#include <iostream>
using namespace std;

int main()
{
    int n;
    int i;
    long a[500000];
    long sum = 0;
    
//    cout << "input number n (<500000)" << endl;
    cin >> n;
    
    for (i = 0; i <= n; ++i)
    {
        cin >> a[i];
        sum += a[i];
    }
    cout << sum << endl;
}