#include <bits/stdc++.h>
using namespace std;
int main() {
  int num;
  cin >> num;
  if (num <= 9) {
    cout << num << endl;
  } else if (10 < num && num <= 189) {
    num = num - 9;
    int tmp = num / 2;
    tmp = 9 + tmp + num % 2;
    if (num % 2)
      cout << tmp / 10 << endl;
    else
      cout << tmp % 10 << endl;
  } else if (190 <= num) {
    num = num - 189;
    int tmp = num / 3;
    if (num % 3 != 0)
      tmp = 100 + tmp;
    else
      tmp = 99 + tmp;
    if (num % 3 == 0) {
      cout << tmp % 10 << endl;
    } else if (num % 3 == 1) {
      cout << tmp / 100 << endl;
    } else {
      tmp = tmp / 10;
      tmp = tmp % 10;
      cout << tmp << endl;
    }
  }
  return 0;
}
