#include<iostream>
#include<cmath>
#include<fstream>

using namespace std;

ifstream fin("fact.in");
ofstream fout("fact.out");

int main () {
      int n,i;
      long p=1;
      fin >> n;
      for (i =1;i<=n;i++){
              while(i<=n)
	           p=p*pow(i,i);}

        if(p<0)fout<<"-1";
            else fout<<"1";


	fin.close();
	fout.close();

	return 0;

}