/**
 *  author:   TakeruOkuyama
 *  created:  2020-04-09 14:53:46
**/
#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

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

/**
**/