#include<fstream.h>

int main(){
    ifstream f("fact.in");
    ofstream g("fact.out");
    unsigned long long p;   
    f>>p;
    unsigned long long rez;
    if ( p == 0)
        g<<1;
    else {
        if ( (p+1) % 6 == 0)
            g<<-1;
        else {
            rez = 5 * (p - (p - 1)/5 );
            g<<rez;    
        }
    }
    return 0;
}