#include <bits/stdc++.h>
using namespace std;

int main() {
	int D;
	cin >> D;

	string s = "";
	for (int i = 1; s.size() < 101; i++) {
		string c = to_string(i);
		s += c;
	}
	//cout << s << endl;
	cout << s.at(D - 1) << endl;
}