#include <stdio.h>
int sumArray(int a[], int n)
{
    if (n != 0)
        return a[n] + sumArray(a,n--);
    return 0;
}

void main()
{
    int n, a[20];
    scanf("%d", &n);
    for (int i = 0; i < 20; i++)
        scanf("%d", &a[i]);
    printf("%d", sumArray(a, n));
}