#include<stdio.h>
#include<stdlib.h>

int main(void) {
	char line[64] = {0};
	int sum = 0;
	
	while (fgets(line, 64, stdin)) {
		sum += atoi(line);
	}
	
	printf("sum is\t%d\n", sum);
	
	return EXIT_SUCCESS;
}

sum is	0