#include<iostream>
#include<iomanip>
#include<cstring>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(){
	int t,n,x,wrong;
	cin>>t;
	while(t--)
	{
		wrong=0;
		cin>>n;
		x=n-7;
		if(x<=7)wrong=1;
		if(wrong)cout<<"-1"<<endl;
		else cout<<x<<endl;
	}
}