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# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;

public class Hello{
  public static void Main(){
    int K = int.Parse(Console.ReadLine());
    char X;
    int count = 0;
    int abc = 0;
    for(int i = 0; i < K ; i++){
      X=(char)Console.Read();
      if(X == ('A')){
        abc = 1;
      }else if(abc == 1 && X == ('B')){
        abc = 2;
      }else if(abc == 2 && X == ('C')){
        count++;
        abc = 0;
      }else{
        abc = 0;
      }
    }
    Console.Write(count);
  }
}