#include <iostream>
#include <string>
using namespace std;
int main() {
	string score, str1;
	int x, y;
	x = 0;
	y = 0;
	cin >> score;
	for (int i = 0; i < 9; i++) {
		str1 = score.substr(i, 1);
		x = stoi(str1);
		if (x == 0) {
			x = 10;
		}
		y = y + x;
	}
	cout << y << endl;


	return 0;
}