n=int(input())
mod=998244353
sum1=pow(2,mod-2,mod)*n*(n-1)
sum2=(n-1)*(n-2)
for i in range(n):
    sum1*=i+1
    sum1%=mod
for i in range(1,n):
    sum2*=i
    sum2%=mod
print(sum1-sum2)