import math


def isPnum(n):
  for v in range(2, int(math.sqrt(n))+1):
    if n % v == 0:
      return v
  return -1


N = int(input())
dp = [0 for _ in range(N+1)]
for i in range(2, N+1):
  val = isPnum(i)
  if val == -1:
    dp[i] = 1
  else:
    dp[i] = dp[i//val] + dp[val]
print(sum(dp))