#include<stdio.h>
	int main(){
		int t,a[200],b[200],i,j,x;
		scanf("%d",&t);
		for(i=0;i<t;i++){
			scanf("%d",&a[i]);}
			for(j=0;j<t;j++){
				b[j]=a[j]-7;}
		for(x=0;x<t;x++){
			if(b[x]>7)
				printf("%d\n",b[x]);
				else
					printf("-1\n");
			
		}
		return 0;}