#include<stdio.h>
#include<stdlib.h>
int main(){
	int T;
	scanf("%d",&T);
	while(T--){
		int n,t;
	scanf("%d",&n);
	t=n-7;
		if(t>=8)
		printf("%d\n",t);
		else
			printf("-1\n");
	}

return 0;
}