#include <iostream>
#include <fstream>

using namespace std;

int main() {
    ifstream fin("fact.in");
    ofstream fout("fact.out");
    long long p, i, count=1;
    fin >> p;
    if (p==0) {
        fout << 1;
        return 0;
    }
    for (i=5; i<=p; i+=6, count++)
        if (p==i) {
            fout << -1;
            return 0;
        }
    fout << 5*p-(count-1)*5;
    return 0;
}