#include<stdio.h>
int main(void){
	int T,A,x;
	scanf("%d",&T);
	while(T--){
		scanf("%d",&A);
		if(A<15){
			printf("-1\n");
			continue;}
		x=A-7;
		if(x>0)
			printf("%d\n",x);
		else
			printf("-1\n");
	}
	return 0;
}