#include <fstream>

using namespace std;

ifstream cin("fact.in");
ofstream cout("fact.out");

int main(){
    long long p;
    cin >> p;
    long long n=0;
    if(p==0){
        cout << 1 << "\n";
        return 0;
    }
    while(p>0){
        n+=5;
        if(n%25==0){
            p--;
        }
        p--;
        if(p<0){
            cout << -1 << "\n";
            return 0;
        }
    }
    cout << n << "\n";
}