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