入门解法，大佬轻喷！！！！！

#include <iostream>
using namespace std;
int main(){
int x,y;
cin>>x>>y;
if(2x>y){
cout<<"No";
}else if(4x<y){
cout<<"No";
}else if(y % 2 == 1){
cout<<"No";
}else{
cout<<"Yes";
}
return 0;
}