#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <tuple>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <cmath>
#include <iomanip>
#define rep(i, n) for(int i = 0; i < (int)(n); ++i)
using namespace std;

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