#include<cstdio>
#include<iostream>
#include<cstdio>
using namespace std;
	int n,k,y,x,a,b;
	int f[15];
	long long ans;
int main()	
{
	freopen("infinit.in","r",stdin);
	freopen("infinit.out","w",stdout);
	f[1]=1;f[2]=1;f[3]=2;f[4]=3;f[5]=3;f[6]=4;f[7]=4;f[8]=5;f[9]=6;f[10]=6;
	f[11]=7;f[12]=8;f[13]=6;
	scanf("%d",&n);
	for (int i=1;i<=n;i++)
	{
		scanf("%lld%lld",&a,&b);
		k=(b-a)/13;
		x=f[a%13]+(a/13)*f[13];
		y=f[b%13]+(b/13)*f[13];
		ans=y-x;
		printf("%lld\n",ans);
	}
	return 0;
}