mod=int(input())
N=mod
u=[1]*(N)
u2=[1]*(N)
for i in range(1,N):
    u[i]=u[i-1]*i
    u[i]%=mod
u2[N-1]=pow(u[N-1],-1,mod)
for i in range(N-2,0,-1):
    u2[i]=u2[i+1]*(i+1)
    u2[i]%=mod
result=sum(u2)
result%=mod
print(result)