#include<stdio.h>
int main(void){
int T;
scanf("%d",&T);
while(T--){
	int s,x;
	scanf("%d",&s);
	if(s<15)
	{x=-1;}
	else
	{x=s-7;}
	 if(x>=2)
	 {printf("%d\n",x);}
	 else 
	 { printf("-1\n");}
}
}