def a(x,u):
   s=w=u//x
   n=3
   g=-1
   while 1:
       w=w//(x*x)
       t=w//n
       if not t:
           break
       s+=g*t
       g=-g
       n+=2
   return s
def pi(d):
   u=10**(d+10)
   pi=4*(4*a(5,u)-a(239,u))
   return pi//10**10
print pi(20)