import math

x=int(input())
if x==2:
  print(989898)
  exit(0)

ans=0
for i in range(2,1000000):
  if pow(i,x-1)*(i-1)>1000000000000000000:
    break
  A=pow(i,x-1)*(i-1)
  ans+=1/A

ans*=1000000

print(math.floor(ans))