#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    string C = "";
    rep(i, 1, 100){
        C += to_string(i);
    }

    int D;
    cin >> D;
    cout << C[D-1] << endl;
    
    return 0;
}