#include <stdio.h>
int main()
{
    int h,r,n;
    scanf("%d %d",&h,&r);
    float m,v=3.14*h*r*r;
    m=10000/v;
    n=10000/v;
    if(m>n)
    {
        n+=1;
    }
    printf("%d",n);
    return 0;
}