import std.experimental.all;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

Tuple!(int, int)[] knightMoves() {
    auto signs = cartesianProduct([1, -1], [1, -1]);
    Tuple!(int, int)[] moves;
    foreach (xy, sx, sy; cartesianProduct([[1, 2], [2, 1]], signs)) {
        moves ~= tuple(xy[0] * sx, xy[1] * sy);
    }
    return moves;
}

bool calc(int sx, int sy) {
    bool rec(int x, int y, int step) {
        if (x == sx && y == sy) return true;
        if (step == 3) return false;

        foreach (dxy; knightMoves()) {
            if (rec(x + dxy[0], y + dxy[1], step + 1))
                return true;
        }
        return false;
    }
    return rec(0, 0, 0);
}

void main() {
    auto xy = readints();
    int x = xy[0], y = xy[1];
    writeln(calc(x, y) ? "YES" : "NO");
}