#include <stdio.h>

using namespace std;

int main()
{
    int n;
    scanf("%d", &n);

    unsigned long long answer = 0;

    for (int i = 0; i < n; i++)
    {
        unsigned long long a;
        scanf("%llu", &a);

        answer += a;
    }

    printf("%llu\n", answer);
}