include <iostream>
#include "stdafx.h"
#include<stdio.h>
int main(void)
{
    long a;
    long b = 0L;
    int c;   
    c = scanf("%ld",&a);
    while (c == 1)
    {
        b = a + b;
            c = scanf("%ld",&a);
    }
    printf("%ld\n",b);
    getchar();
    return 0;
}