Problem:
Score : 100 points

Problem Statement

Takahashi has K 500-yen coins. (Yen is the currency of Japan.)
If these coins add up to X yen or more, print Yes; otherwise, print No.

Constraints

1 \leq K \leq 100

1 \leq X \leq 10^5

Input

Input is given from Standard Input in the following format:

K X

Output

If the coins add up to X yen or more, print Yes; otherwise, print No.

Sample Input 1

2 900

Sample Output 1

Yes

Two 500-yen coins add up to 1000 yen, which is not less than X = 900 yen.

Sample Input 2

1 501

Sample Output 2

No

One 500-yen coin is worth 500 yen, which is less than X = 501 yen.

Sample Input 3

4 2000

Sample Output 3

Yes

Four 500-yen coins add up to 2000 yen, which is not less than X = 2000 yen.

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;

namespace abc150_a
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] KX = Console.ReadLine().Split(" ");
            int K = int.Parse(KX[0]);
            int X = int.Parse(KX[1]);
            int sum = K * 500;

            if(X <= sum)
            {
                Console.WriteLine("Yes");
            }else
            {
                Console.WriteLine("No");
            }
        }
    }
}