#include<stdio.h>
#include<stdlib.h>

int main()
{
	int T;
	scanf("%d", &T);
	while(T--)
	{
		int N;
		scanf("%d",&N);
		int sum;
		sum=N-7;
		if(sum>=8)
			printf("%d\n",sum);
		else
			printf("-1\n");
	}


}