#include <bits/stdc++.h>

using namespace std;

ifstream in("2x3y5z.in");
ofstream out("2x3y5z.out");

int n, c2, c3, c5;
vector <long long> v;

int main() {
    in >> n;
    if (n == 1)
        return out << 1, 0;
    v.emplace_back(1);
    for (int i = 1; i < n; ++i) {
        long long next = min(2 * v[c2], min(3 * v[c3], 5 * v[c5]));
        v.emplace_back(next);
        if (next == 2 * v[c2]) ++c2;
        if (next == 3 * v[c3]) ++c3;
        if (next == 5 * v[c5]) ++c5;
    }
    return out << v[(int)v.size() - 1], 0;
}