题解

#include <bits/stdc++.h>
using namespace std;
int main(){
	int ji=0,tu=0,a,b;
	cin >> a >> b;
	tu+=(b-a*2)/2;
	ji+=a-tu;
	if(ji<0 || tu<0){
		cout << "No";
		return 0;
	}
	if(ji*2+tu*4==b ){
		cout << "Yes";
	}else{
		cout << "No" ; 
    } 
 	 return 0;          
}