n=int(input())
if n<4:
  print(0)
  exit()
M=998244353
fa=[1,1]
fb=[1,1]
for i in range(2,n+1):
  fa+=[fa[-1]*i%M]
  fb+=[fb[-1]*(M//i)*fb[M%i]*fa[M%i-1]*(-1)%M]
g=0
for a in range(2,n-1):
  b=n-a
  g+=(fa[n]*(fb[a+b-1]*fa[a+b-1-1])*(fb[a]*fa[a-1])*(fb[b]*fa[b-1])*fb[a-2]*fb[b-2]%M)**2
  g%=M
print(g)