#include<stdio.h>
int main(void){
	int t,i;
	int num;
	int m =-1;
	int num1;
	scanf("%d",&t);
	for (i = 0 ; i< t ;i++){
		scanf("%d",&num);
		num1 =num-7;
		if(num < 15)
			printf("%d\n",m);
		else
			printf("%d\n",num1);
	}
	return 0;
}