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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
#include<stdlib.h>


int cmp(const int *a,const int *b){

return *a > *b ? -1 : *a < *b ? 1 : 0 ;
}
//qsort(pa,n,sizeof(int),(int(*)(const void* ,const void*))cmp);

int main(void){
  int k,x;
  scanf("%d%d",&k,&x);
  if(500*k>=x){
    printf("Yes");
    return 0;
  }
  else{
    printf("No");
  }




  return 0;
}