#include <algorithm>
#include <cmath>
#include <cstdio>
#include <deque>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

using namespace std;

typedef long long ll;

#define MOD 1000000007

int main() {
  int d;
  cin >> d;
  string s = "";
  for (int i = 1; i <= 100; ++i) {
    s += to_string(i);
  }
  cout << s[d - 1] << endl;
  return 0;
}