import std.algorithm; import std.array; import std.conv; import std.math; import std.stdio; import std.string; import std.range; int readint() { return readln.chomp.to!int; } int[] readints() { return readln.split.map!(to!int).array; } 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 (dx; [1, 2]) { foreach (dy; [1, 2]) { if (dx == dy) continue; foreach (s1; [1, -1]) { foreach (s2; [1, -1]) { int x2 = x + (dx * s1); int y2 = y + (dy * s2); if (rec(x2, y2, 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"); }