#include <iostream>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#include <string>
#include <sstream>
#include <complex>
#include <vector>
#include <list>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <set>
#include <fstream>

using namespace std;

typedef long long unsigned int ll;

#define rep(i,n)for(i=0;i<n;i++)
#define FOR(i,a,n) for(i=a;i<n;i++)
#define ALL(s)s.begin(), s.end()

#define INF (1e9)
#define PI  (acos(-1))




int main()
{
	string S;
	cin >> S;
	int score = 0, i;
	rep(i, 9) {
		int ini = stoi(S.substr(i, 1));
		if (ini == 0) ini = 10;
		score += ini;
	}

	cout << score << endl;
	return 0;


}