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 Rust (1.42.0) (judge verdict: Accepted)

use std::io::{self, Read};

fn main() {
  let mut buf = String::new();
  io::stdin().read_to_string(&mut buf).unwrap();
  let tokens: Vec<&str> = buf.split_whitespace().collect();
  let k: i64 = tokens[0].parse().unwrap();
  let x: i64 = tokens[1].parse().unwrap();

  if 500*k >= x {
    println!("Yes");
  } else {
    println!("No");
  }
}