#include <stdio.h>

int main()
{
    int x, sum, status;

    sum = 0;
    while ((status = scanf("%d", &x)) == 1)
        sum += x;
    if (status != EOF) {
	fprintf(stderr, "add: non-numeric input\n");
	return(1);
    }

    printf("%d\n", sum);
    return(0);
}