#include <math.h>
#include <stdio.h>
#define Pi 3.14

int main(void)
{
    int h,r,all,op=0,num;
    scanf("%d %d",&h,&r);
    all=Pi*h*r*r;
    if(10000%all)op=1;
    num=10000/all+op;
    printf("%d\n",num);
}