//#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;

int main() {
	 
	string an="123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960";
	ll D;
	cin>>D;
	cout<<an[D-1]<<endl;

}