#include <cstdio>
#include <string>
#include <iostream>
using namespace std;
int main() {
  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';
    }
  }
  printf("%d\n", score);
  return 0;
}