#include <bits/stdc++.h>
#define ll long long
ll p,n=1;
using namespace std;
int gcd(int a,int b){
    if(b==0) return a;
    return gcd(b,a%b);
}
int main() {
    ifstream cin;
    cin.open("fact.in");
    ofstream cout;
    cout.open("fact.out");
    cin>>p;
    for(int i=1;i<=p*5;i++){
        n=n*i;
        if(n==p*5){
            cout<<n;
            return 0;
        }
    }
    cout<<"-1";
    return 0;
}