#define _USE_MATH_DEFINES
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<string>
#include<iostream>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include <sstream>
#include<iomanip>
#include <ctype.h>
#include <fstream>
#include <cassert>
//#include <bits/stdc++.h>
using namespace std;

//#include<bits/stdc++.h>

	
int main() {

	int a; int n = 1;
	cin >> a;
	string p;

	while (p.size() < 103) {
		stringstream ss;
		ss << n;
		p += ss.str();
		n++;
	}
	cout << p[a-1] << endl;

	return 0;
}