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 (1.15.1) (judge verdict: Accepted)

use std::io::Read;

fn main() {
    let mut buf = String::new();
    std::io::stdin().read_to_string(&mut buf).unwrap();

    let answer = solve(&buf);

    println!("{}", answer);
}

fn solve(input: &str) -> String {
    let mut iterator = input.split_whitespace();

    let k: u32 = iterator.next().unwrap().parse().unwrap();
    let x: u32 = iterator.next().unwrap().parse().unwrap();

    return if k * 500 >= x {
        String::from("Yes")
    } else {
        String::from("No")
    }
}

#[test]
fn test() {
    assert_eq!(
        solve(
            r"2 900"
        ),
        "Yes"
    );
    assert_eq!(
        solve(
            r"1 501"
        ),
        "No"
    );
    assert_eq!(
        solve(
            r"4 2000"
        ),
        "Yes"
    );
}