#include <bits/stdc++.h>
#define rep(i, n) for (ll i = 0; i < n; ++i)
typedef long long ll;
using namespace std;
const int INF = 1e9;

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

    string s = "";
    for (int i = 1; i <= n / 2 + 10; ++i) {
        s += to_string(i);
    }

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

    return 0;
}