#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;cin >> n;
    vector<long long> a;
    a.push_back(1);
    for(long long i = 1;i<10;i++){
        for(long long j = 1; j < 10; j++){
            a.push_back((100000LL + i) * (100000LL + j));
        }
    }
    sort(a.begin(), a.end());
    cout << a[n] << endl;
    return 0;
}