include <stdio.h>

int main() {

int a, b, c, d, e, m, h; scanf("%d", &a); e = a % 10; a = a / 10; d = a % 10; a = a / 10; c = a % 10; a = a / 10; b = a % 10; a = a / 10; m = a % 10; h = d + b + e + c + m; printf("%d", h);

return 0; }