#include<stdio.h>
int main()
{
  int h,r,v,n;
  scanf("%d %d",&h,&r);
  v=h*r*r*3.14;
  n=20000/v;
  if(20000%v==0){
    printf("%d",n);
  }else{
    printf("%d",n+1);
  }
  return 0;
)