#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=100010;
string s;
int sum;
int main () {
    freopen("movement.in","r",stdin);
    freopen("movement.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
    cin >> s;
    for (int i=0;i<s.size();i++) {
        if (s[i]=='1') sum++;
        else if (s[i]=='2') sum++;
        else if (s[i]=='3') sum+=2;
    }
    cout << sum+1 <<endl;
    return 0;
}