#include <bits/stdc++.h>
using namespace std;
int N;
string S;
void precompute() {
  int cur = 1;
  while ((int)S.size() <= 1000) {
    int x = cur++;
    string tmp;
    while (x > 0) {
      tmp.push_back(x % 10 + '0');
      x /= 10;
    }
    for (int i = (int)tmp.size() - 1; i >= 0; i--) S.push_back(tmp[i]);
  }
}
int main() {
  precompute();
  scanf("%d", &N);
  printf("%c\n", S[N - 1]);
  return 0;
}
