#include <bits/stdc++.h>

using namespace std;

#define INF 2000000000
#define MOD 1000000007
typedef long long ll;
typedef pair<int, int> P;

int a, b;

bool dfs(int tmpx, int tmpy, int tmpcnt){
	int x = tmpx;
	int y = tmpy;
	int cnt = tmpcnt;
//	cout << x << " " << y << " " << cnt << "\n";
	if (cnt>3) {
		return false;
	}
	if (x==a && y==b) {
		return true;
	}

	if (dfs(x-2,y-1,cnt+1)) {
		return true;
	}
	if (dfs(x-2,y+1,cnt+1)) {
		return true;
	}

	if (dfs(x-1,y-2,cnt+1)) {
		return true;
	}
	if (dfs(x-1,y+2,cnt+1)) {
		return true;
	}

	if (dfs(x+1,y-2,cnt+1)) {
		return true;
	}
	if (dfs(x+1,y+2,cnt+1)) {
		return true;
	}

	if (dfs(x+2,y-1,cnt+1)) {
		return true;
	}
	if (dfs(x+2,y+1,cnt+1)) {
		return true;
	}
}


int main()
{
	cin >> a >> b;

	if (dfs(0,0,0)) {
		cout << "YES" << "\n";
	} else {
		cout << "NO" << "\n";
	}

}