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

fact = [1]*(N+1)
rfact = [1]*(N+1)
r = 1
for i in range(1, N+1):
    fact[i] = r = r * i % MOD
rfact[N] = r = pow(fact[N], -1, MOD)
for i in range(N, 0, -1):
    rfact[i-1] = r = r * i % MOD

def comb(n, k):
    return fact[n] * rfact[k] * rfact[n-k] % MOD

ans = 0
for i in range(1,N+1):
    tmp = comb(N,i)
    tmp *= pow(i,N-i,MOD)
    tmp %= MOD
    ans += tmp
    ans %= MOD

print(ans)