题解

#include<bits/stdc++.h> 
using namespace std;
typedef long long ll;
ll j,t;
ll x,y;
int main(){
	cin>>x>>y;
	t=(y-2*x)/2;
	j=x-t;
	if(t<0 or j<0){
		cout<<"No";
		return 0;
	}
	if(j*2+t*4==y) cout<<"Yes";
	else cout<<"No";
	return 0;
}