#include<bits/stdc++.h> using namespace std; int main() { vector <int> a; a.push_back(0); for(int i = 1; i <= 214286; ++i) { if (i % 3 == 0 || i % 5 == 0) a.push_back(i); } int n; while(cin >> n) { cout << a[n] << '\n'; } return 0; }