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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function main(input){
  const args = input.split(' ');
  const k = parseInt(args[0],10);
  const x = parseInt(args[1],10);
  
  if(500 * k >= x){
    console.log('Yes');

  }
  else{
    console.log('No');

  }
}

main(require('fs').readFileSync('/dev/stdin','utf8'));