#include <iostream>

using namespace std;

int gx, gy;

bool dfs(int x, int y, int depth) {
    if (depth > 3)return false;
    if (x == gx && y == gy) return true;
    return dfs(x - 2, y - 1, depth + 1) ||
           dfs(x - 2, y + 1, depth + 1) ||
           dfs(x - 1, y - 2, depth + 1) ||
           dfs(x - 1, y + 2, depth + 1) ||
           dfs(x + 1, y - 2, depth + 1) ||
           dfs(x + 1, y + 2, depth + 1) ||
           dfs(x + 2, y - 1, depth + 1) ||
           dfs(x + 2, y + 1, depth + 1);
}

int main() {
    cin >> gx >> gy;
    cout << (dfs(0, 0, 0) ? "YES" : "NO") << endl;
    return 0;
}