#include <bits/stdc++.h>
using namespace std;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}
using Int = long long;
const char newl = '\n';

//INSERT ABOVE HERE
signed main(){
  cin.tie(0);
  ios::sync_with_stdio(0);
  string s;
  cin>>s;

  Int ans=0;
  for(Int i=1;i<(Int)s.size();i++){
    if(s[i]=='0') continue;
    ans++;
  }
  cout<<ans<<endl;
  return 0;
}