#include<iostream>
#include<cstdlib>
using namespace std;
int main(){
	int n,m,t;
	cin>>t;
	int i;
	for(i=1;i<=t;++i)
	{
		cin>>n;
		if(n<15)
			cout<<-1<<endl;
		else
			cout<<n-7<<endl;
	}
	return 0;

}