#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int,int>;
#define rep(i,n) for(int i=0;i<n;i++)

const ll mod = ll(1e9) + 7;
const int INF = 1<<29;

int main(){
    int d;
    cin >> d;
    vector<char> c;
    int i = 0;
    while (c.size()<d+1){
        string s = to_string(i);
        rep(j,s.size()) c.push_back(s[j]);
        i++;
    }
    cout << c[d] << endl;
    return 0;
}