#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main() {
    int64_t d;
    cin >> d;

    string s;
    for (int64_t i = 1; i <= 100; i++) {
        s += to_string(i);
    }

    cout << s[d - 1] << endl;

    return 0;
}