#include <iostream>
#include <string>
#include <vector>
#include <set>
#include <cmath>
#include <stack>
#include <algorithm>
#include <iomanip>
#include <map>
#include <queue>
#include <functional>
#include <numeric>
using ll = long long;
using namespace std;

const ll MOD = 1e9 + 7;

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

    string t = "";
    for (int i = 0; i <= 100; ++i)
    {
        t += to_string(i);
    }
    cout << t[D] << endl;
    return 0;
}