#include<stdio.h>

int main(){
	int t;
	int m,n,i,g,h,temp;
	int a[100],count=0;
	scanf("%d",&t);
	while(t--){
		scanf("%d",&m);
		if(m-7>7){
			printf("%d\n",m-7);
		}else printf("-1\n");
}
	return 0;
}