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++14 (GCC 5.4.1) (judge verdict: Accepted)

/*its_Rashid*/
#include <bits/stdc++.h>
using namespace std ;

typedef double du ;
typedef string st ;
typedef long long ll ;

int main ()
{
    ll num1 , num2 , res = 0 ;
  cin >> num1 >> num2 ;
  
  res = num1 * 500 ;
  
  if (res >= num2 )
    cout << "Yes" << endl ;
  else 
    cout << "No" << endl ;
  
    return 0 ;
}