#include <bits/stdc++.h>
using namespace std;
long long n,m,l,r,sum=0,i,j,k;
bool f=true;
int main()
{
	cin>>n>>m;
	for (i=1;i<=n;i++)
	{
		sum=0;
        cin>>l>>r;
		if (r>m||l<1)
		{
			cout<<"Crossing the line"<<endl;
			continue;
		}
		for (j=l;j<=r;j++)
	    {
		    if (j==1||(j%2==0&&j!=2)) continue;
		    for (k=2;k<=sqrt(j);k++)
		    	if (j%k==0) 
		    	{
		    		f=false;
		    		break;
		   		}
		    if (f==false)
		    {
		    	f=true;
				continue;
			}
		    sum++;
	    }
		cout<<sum<<endl;
	}
	return 0;
}