#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

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