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

	}
	return 0;
}