#include <stdio.h>

int main() {
   float pi=3.14;
   int h=0,r=0;
   float b=0.0f;
   float c=10000;
   int count=0;
   scanf("%d %d",&h,&r);
  b=h*r*r*pi;
  while(c>0)
  {
    c=c-b;
    count++;
  }
  printf("%d",count);
    return 0;
}