#include <iostream.h>
#include <stdio.h>
int main()
{
int p,k,i,z;
unsigned n,emi;
FILE *fin,*fout;
fin=fopen("factorial.in","r");
scanf("%d",p);
fclose(fin);
n=1;
i=2;
do
 {
 n*=i;//calculeaza factorialul
 i++;
 z=0;//indicator pt nr de 0-uri ale lui n
 emi=n;//salvez valoarea lui n pt a nu se pierde
 k=0;
  while (k==0)
      {
      k=n%10;
      n=n/10;
      z++;
      }
  }while (z!=p);
  fout=fopen("factorial.out","w");
  if (z==p) fprintf("%ld",emi)
  else fprintf("-1");
  fclose(fout);
  return 0;
  }