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