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

int main(void)
{
	int T;
	scanf("%d",&T);
	
	while(T)
	{
		int nianling;
		scanf("%d",&nianling);
		if(nianling<15)
		{
			printf("-1\n");
		}
		else
		{
			printf("%d\n",nianling-7);
		}
		T--;
	}

}