#include<stdio.h>
int main ()
{
	int T,A,X;
scanf("%d", &T);
{
 while (T--) 
 {
	 scanf("%d",&A);
	 X=A-7;
	 if(X>=8)
		 printf("%d\n",X);
	 else 
	     printf("-1\n");
 }
}
 return 0;
}