#include<iostream>
using namespace std;
int main()
{
	string str;
	cin>>str;
	long long i,q;
	cin>>q;
	for(i=0;i<q;i++)
	{
		long long l,r,j,count;
		cin>>l>>r;
		count=r-l+1;
		count=count/2;
		cout<<count<<"\n";
	}
}