#include<fstream.h>
#include<math.h>
int v[12];
int main()
{
	long n=0,p,i,nr=0,x;
	ifstream fcin("fact.in");
	ofstream fcout("fact.out");
	fcin>>p;
	while(nr<p){
		v[1]+=5;nr+=4;n=4*5;
		for(i=2;i<=12;i++){
			if(v[i-1]%5==0)v[i]++;
			else{nr+=i-1;x=pow(5,i-1);n=v[i-1]*x;break;}
		}
	}
	if(p==nr)fcout<<n;
	else fcout<<-1;
	return 0;
}