mod=int(input())
N=mod
c=1
for i in range(1,N):
    c*=i
    c%=mod
c=pow(c,-1,mod)
result=c
for i in range(N-2,0,-1):
  c*=i+1
  c%=mod
  result+=c
  result%=mod
result+=1
result%=mod
print(result)