#include <bits/stdc++.h>
using namespace std;
int main()
{
  int K,X;
  string a;
  cin>>K>>X;
  a=500*K<X?"No":"Yes";
  cout<<a<<endl;
}
### Prompt

Develop a solution in cpp to the problem described below:

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()
{
  int K,X;
  string a;
  cin>>K>>X;
  a=500*K<X?"No":"Yes";
  cout<<a<<endl;
}
```