#include<algorithm>
#include<iostream>
#include<stdio.h>
#include<string>
#include<vector>
#include <cmath>
#include <algorithm>
#include <functional>

using namespace std;


int main(){

    int D;
    cin >> D;

    string ch = "0.";
    for ( int i = 1;i < 101; i++){
        ch += to_string(i);
    }

    cout << ch[D + 1];


    return 0;
}