#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>

#define rep(i,p,n) for(int i=p;i<n;i++)
#define lli long long int
#define vi vector<int> 

using namespace std;

int max(int x, int y) {
	int a;
	(x > y) ? a = x : a = y;
	return a;
}

int min(int x, int y) {
	int a;
	(x < y) ? a = x : a = y;
	return a;
}

int main() {
	char c[10];
	for (int i = 0; i < 10; i++)c[i] = '0'+i;
	int sum = 0;
	string s;
	getline(cin, s);
	for (int i = 0; i < s.length(); i++) {
		for (int j = 0; j < 10; j++) {
			if (s[i] == c[j]) sum += j;
		}
	}

	cout << sum << endl;
	return 0;
}