#include <bits/stdc++.h>
using namespace std;

int main(){
	long long int x,y;
	cin >> x >> y;
	x = fabs(x);
	y = fabs(y);
	for(int i = 0; i < 3; i++){
		if(x > y){
			x -= 2;
			y -= 1;
		}else{
			x -= 1;
			y -= 2;
		}
		if(x == 0 and y == 0){
			cout << "YES" << endl;
			return 0;
		}
	}
	cout << "NO" << endl;
	return 0;
}