# -*- coding: utf-8 -*-

import sys

N = int(input())
M = 10**9 + 7

dp = [0] * (10**5 + 1)
def recurrence(n):
    if n==0:
        dp[n] = 0
    elif n==1:
        dp[n] = 1
    elif n==2:
        dp[n] = 2
    else:
        dp[n] = (n*dp[n-1] + dp[n-2]) % M

for i in range(N+1):
    recurrence(i)

print((dp[N]-dp[N-2]) % M)