#include<bits/stdc++.h> 
using namespace std;
int main(){
	long long int a,b,c;
	cin>>a;
	for(int i=0;i<a;i++){
		cin>>b>>c;
		if(c==0){
			cout<<'1'<<endl;
		}else{
			int max=b/c;
			int min=(b/(c+1))+1;
			cout<<max-min+1<<endl;
		}
	}
}