#include<bits/stdc++.h>
using namespace std;
using Int = long long;
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;}

//INSERT ABOVE HERE
signed main(){
  Int d;
  cin>>d;
  for(Int i=0;;i++){
    string s=to_string(i);
    if((Int)s.size()<=d){
      d-=s.size();
      continue;
    }
    cout<<s[d]<<endl;
    break;
  }
  return 0;
}