#include<stdio.h>
#define i 100
int main(void){
	int a[i];
	double b,m;
	int n,c,j;
	scanf("%d",&c);
	for(j=0;j<c;j++){
		scanf("%if",&a[j]);}
	for(j=0;j<c;j++){
		m=a[j]-7;
		if(m>=8)
			printf("%d\n",a[j]-7);
	
		else 
			printf("-1\n");
	

}}