p=int(input())
M=p
N=p
F=[1]*N;l,f=F[:],F[:]
for i in range(2,N):F[i]=F[i-1]*i%M;l[i]=-(M//i)*l[M%i]%M;f[i]=f[i-1]*l[i]%M
ans=ni=1
for i in range(1,p):
  ni*=i
  ni%=p
  ans+=f[ni]
  ans%=p
print(ans)