#include<bits/stdc++.h>
using namespace std;
int n,m,s[70010],a,ans,b;
int main(){
	cin>>n>>m;
	for(int i=1;i<=n;i++){
		s[i]=s[i-1]+i;
	}
	for(int i=1;i+m-1<=n;i++){
		a=s[i+m-1]-s[i-1];
		b=sqrt(a);
		if(b*b==s[i+m-1]-s[i-1]){
			ans++;
		}
	}
	cout<<ans;
	return 0;
}