#include <bits/stdc++.h>
using namespace std;
int s[1000 * 1000];
int main() {
  int cnt = 1;
  for (int i = 1; i <= 1005; i++) {
    int t = i;
    int a[10];
    int cnt1 = 1;
    while (t) {
      int tmp = t % 10;
      a[cnt1++] = tmp;
      t = t / 10;
    }
    for (cnt1--; cnt1; cnt1--) s[cnt++] = a[cnt1];
  }
  int n;
  while (scanf("%d", &n) != EOF) printf("%d", s[n]);
  return 0;
}
