#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string num = "";
  rep(_, 100) {
    if (_ == 0) continue;
    num += to_string(_);
  }
  Debug(num.size());
  int d;
  cin >> d;
  cout << num[d - 1] << endl;
  return 0;
}