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