#include <iostream>
#include <vector>
#include <string>

using namespace std;

typedef long long LL;

bool srch(LL gx, LL gy, LL x, LL y, int rest){
    if(gx == x && gy == y) return true;
    if(rest <= 0) return false;
    if(srch(gx, gy, x + 2, y + 1, rest-1)) return true;
    if(srch(gx, gy, x + 2, y - 1, rest-1)) return true;
    if(srch(gx, gy, x - 2, y + 1, rest-1)) return true;
    if(srch(gx, gy, x - 2, y - 1, rest-1)) return true;
    if(srch(gx, gy, x + 1, y + 2, rest-1)) return true;
    if(srch(gx, gy, x - 1, y + 2, rest-1)) return true;
    if(srch(gx, gy, x + 1, y - 2, rest-1)) return true;
    if(srch(gx, gy, x - 1, y - 2, rest-1)) return true;
    return false;
}

int main(){
    LL x, y;
    cin >> x >> y;
    if(srch(x, y, 0, 0, 3)){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
    return 0;
}