import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
int h=input.nextInt();
int r=input.nextInt();
int c=h*r*r;
double d=c*3.14;
double a=20000/d;
double z=a*10;
double x=(int)(z+3);
double f=x/10;
int k=(int)f+1;
System.out.println(k);
}
}