#include<iostream>
#include<fstream>
using namespace std;
int main()
{
    int p,t;
    ifstream f("fact.in");
    ofstream g("fact.out");
    f>>p;
    t=p/5;
    if(p%6==5)
        g<<-1;
    else
        {
            if(p==0)
            g<<1;
        else
        {
        if(p%5!=0)
            g<<(p-t)*5;
        else g<<(p-t+1)*5;
    }
    }
    return 0;
}