n=int(input())

R={1:1,2:2,3:6,4:28}

def f(x):
    if x==1:return 1
    if x<=3:k=R[x-1]
    else:k=R[x-2]//(x-2)+R[x-1]
    
    R[x]=k*x%(10**9+7)
    return R[x]


for i in range(1,n):f(i)
#    print(i,f(i))
print(f(n)%(10**9+7))