#include <iostream>
using namespace std;
int main(void) {
	string s;
	cin >> s;
	int score = 0;
	for (int i = 0; i < 9; ++i) {
		if (s[i] == '0') score += 10;
		else score += s[i] - '0';
	}
	cout << score << endl;
	return 0;
}