#include <cstdio>
using namespace std;

int main()
{

  int p,rez=0,cop;

  freopen("fact.in", "r", stdin);
  freopen("fact.out", "w", stdout);

  scanf("%d", &p);
  if(p==0)
	printf("%d", 1);
  else
    for(int i=5; i<=100000000; i+=5)
	{
	  cop = i;
	  while(cop%5==0)
		cop /= 5, rez++;
	  if(rez==p)
	  {
		printf("%d", i);
		return 0;
	  }
	  else if(rez>p)
	  {
		printf("%d", -1);
		return 0;
	  }
	}
}