题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    int a,b,c=0;
    cin>>a>>b;
    for(int i=1;i<=a;i++) if(i*2+(a-i)*4==b) c++;
    if(c>0) cout<<"Yes";
    else cout<<"No";
    return 0;
}