#include <bits/stdc++.h>

using namespace std;

int main(void) {
  string s;
  int now = 1;

  while (s.size() < 100) {
    s += to_string(now);
    ++now;
  }

  int d;
  cin >> d;

  cout << s[d-1] << endl;
  return 0;
}