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

int c2score(char c);

int main()
{
	char* S;
	int score = 0;

	S = (char*)malloc(sizeof(char) * 9);

	if (S == NULL) {
		return -1;
	}

	if (scanf("%s", S) != 1) {
		return -1;
	}

	for (int i = 0; i < 9; i++) {
		score += c2score(*(S + i));
	}

	printf("%d", score);

	return 0;
}

int c2score(char c)
{
	switch (c) {
	case '0':
		return 10;
	case '1':
		return 1;
	case '2':
		return 2;
	case '3':
		return 3;
	case '4':
		return 4;
	case '5':
		return 5;
	case '6':
		return 6;
	case '7':
		return 7;
	case '8':
		return 8;
	case '9':
		return 9;
	default:
		return 0;
	}
}