#include <fstream.h>
#include <iostream.h>
int main()
{
	long long int p,crt,nrde5=0,i;
	fstream f,g;
	f.open("fact.in",ios::in);
	f>>p;
	f.close();
	g.open("fact.out",ios::out);
	long long int k;
	for(i=5;i<=4000000000;i+=5)
	{
		if(i%25==0)
		{	nrde5+=2;
			k=i/25;
			while(k%5==0)
			{ nrde5++;k/=5;}
		}
		else
			nrde5++;
		if(nrde5>=p)
			break;
	}
	if(nrde5==p)
		g<<i;
	else
		g<<-1;
	g.close();
return 0;}