#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
	int n,m;
	int c[100];
	int t;
	cin>>t;
	while(t--)
	{
		cin>>n;
		m=n-7;
		if(m>=2&&n>=15)
			cout<<m<<endl;
		else
			cout<<"-1"<<endl;
		//cout<<i<<endl;
	}
	//cout<<"11\n";
	return 0;
}