#include<stdio.h>
int main(void){
	int T,n,m;
	scanf("%d",&T);
	for(n=1;n<=T;n++){
		scanf("%d",&m);
		if(m<15) 
			printf("%d\n",-1);
		else 
			printf("%d\n",m-7);
	}
	return 0;
}