#include <bits/stdc++.h>

using namespace std;

int main(){
  long long n, x;

  cin>> n>> x;

  cout<< (n*500>=x? "Yes\n":"No\n");
}

### Prompt

Construct a Cpp code solution to the problem outlined:

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`.

Examples

Input

2 900


Output

Yes


Input

1 501


Output

No


Input

4 2000


Output

Yes

### Response

```cpp
#include <bits/stdc++.h>

using namespace std;

int main(){
  long long n, x;

  cin>> n>> x;

  cout<< (n*500>=x? "Yes\n":"No\n");
}

```