#include <iostream>
#include<cstdio>
#include<cmath>
using namespace std;
int main()
{
	int n,a,b;
	double f;
	scanf("%d",&n);
	while(n--)
	{
		double fare1=0,fare2=0;
		int d,t;
		scanf("%d %d",&d,&t);
		if(d>3&&d<=10)
		{
			fare1+=(d-3)*2;
			fare2+=(d-3)*2.5;
		}
		else if(d>10)
		{
			fare1+=7*2+(d-10)*3;
			fare2+=7*2.5+(d-10)*3.75;
		}
		fare1+=(t/5.0)*2;
		fare2+=(t/4.0)*2.5;
		a=round(fare1);
		b=round(fare2);
		if(a>b)
				printf("%d\n",a-b);
		else
				printf("%d\n",b-a);
	}
}