#include <stdio.h>

int main(){
	int t,a,x;
	scanf("%d",&t);
	while(t--){
	   scanf("%d",&a);
	   x=a-7;
	   if(a>=9&&x>a/2){
	      printf("%d\n",a-7);
	   }else{printf("-1\n");}
	}
	return 0;
}