#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<numeric>
using namespace std;
int inf = 1e9;

int main(){
  string s = "";
  for(int i=0; i<=100; i++){
    s += to_string(i);
  }
  int d; cin >> d;
  cout << s[d] << endl;
  return 0;
}