#include<stdio.h>

int main(){
  
 unsigned long int n,b,i,ans;
  ans=1;
   
  (void) scanf("%lu",&n);
 
  
  for (i=0;i<n;i++)
  {
  (void) scanf("%lu",&b); 
    if (b==0)
    {
      printf("0");
      return 0;
    }
  } 
  
  for (i=0;i<n;i++)
  {
  (void) scanf("%lu",&b); 
    ans=ans*b;
    if (ans>1000000000000000001)
    {
      printf("-1");
      return 0;
    }
  }
  
 if (ans<1000000000000000001) {
 printf("%lu",ans);
 } else { 
 printf("-1");
 }
 return 0; 
}