#include<stdio.h>
int main()
{
double h,r,n;
scanf("%lf %lf",&h,&r);
n=20000/(3.1415926rr*h)+1;
printf("%d",n);
return 0;
}
#include<stdio.h>
int main()
{
double h,r,n;
scanf("%lf %lf",&h,&r);
n=20000/(3.1415926rr*h)+1;
printf("%d",n);
return 0;
}