Problem:
Score : 100 points

Problem Statement

You are given integers A and B, each between 1 and 3 (inclusive).

Determine if there is an integer C between 1 and 3 (inclusive) such that A \times B \times C is an odd number.

Constraints

All values in input are integers.

1 \leq A, B \leq 3

Input

Input is given from Standard Input in the following format:

A B

Output

If there is an integer C between 1 and 3 that satisfies the condition, print Yes; otherwise, print No.

Sample Input 1

3 1

Sample Output 1

Yes

Let C = 3. Then, A \times B \times C = 3 \times 1 \times 3 = 9, which is an odd number.

Sample Input 2

1 2

Sample Output 2

No

Sample Input 3

2 2

Sample Output 3

No

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Collections.Generic;
using System.Linq;

class Program {
	static void Main()
	{
		var n = int.Parse(Console.ReadLine());
		var words = Enumerable.Range(0, n).Select(_ => Console.ReadLine()).ToArray();
		var already = new HashSet<string>();
		
		for (var i = 1; i < words.Length; i++) {
			var current = words[i];
			var previous = words[i - 1];
			
			if (!already.Add(current)) {
				Console.WriteLine("No");
				return;
			}
			
			if (current.First() != previous.Last()) {
				Console.WriteLine("No");
				return;
			}
		}
		
		Console.WriteLine("Yes");
	}
}