from math import pi
def zeta(x):
  if x==2:
    return pi*pi/6
  s=0
  for i in range(1,int((10**12)**(1/(x-1)))+2):
    s+=1/i**(x)
  return s
s=1
for i in range(2,int(input())):
  s-=zeta(i)-1
  #print(s,i)
print(int(s*1000000))