#include<stdio.h>
int main(void)
{
	int j,a,i,age;
	scanf("%d",&j);
	for(i=-3;i<j-3;i++)
	{
		scanf("%d",&age);
			if(age<15)
				printf("-1\n");
			else if(age>14)
				printf("%d\n",age-7);
	}
	return 0;
}