#include<stdio.h>
int main()
{
	int t, n;
	scanf("%d", &t);
	int a[205];
	for(int i = 0; i < t; i++)
	{
		a[i] = -1;
		scanf("%d", &n);
		if(n < 15)
			a[i] = -1;
		else
			a[i] = n - 7;
	}
	for(int i = 0; i < t; i++)
		printf("%d\n", a[i]);
}