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)

fn main() {
    let r = std::io::stdin();
    let mut sc = Scanner::new(r.lock());
    let v = sc.read_line();
    
    let n : usize = v[0].parse().unwrap();
    let x : usize = v[1].parse().unwrap();

    solve(n, x);
}

fn solve(n: usize, x: usize) {

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

pub struct Scanner<R: std::io::Read> (std::io::BufReader<R>);
 
impl<R: std::io::Read> Scanner<R> {
    pub fn new(r: R) -> Scanner<R> {
        Scanner (std::io::BufReader::new(r))
    }
 
    pub fn read_line(&mut self) -> Vec<String> {
        use std::io::BufRead;
        let mut line = String::new();
        self.0
            .read_line(&mut line)
            .unwrap();
 
        line.split_whitespace()
            .map(|b| b.to_string())
            .collect::<Vec<String>>()
    }
}