#include<iostream>
#include<algorithm>
#include <vector>
#include<cmath>
#include<iomanip>
using namespace std;
typedef long long int lont;
int main() {
	string S;
	cin >> S;
	int Z = S.size();
	vector<char>vec(10);
	vec = { '0','1','2','3','4','5','6','7','8','9' };
	int sum = 0;
	for (int ia = 0; ia < Z; ia++) {
		for (int ib = 0; ib < 10; ib++) {
			if (S.at(ia) == vec.at(ib)) {
				sum += ib;
			}
		}
	}
	cout << sum << endl;
}