import sys
input = sys.stdin.readline

N,A,B=map(int,input().split())

mod=998244353

ANS=1
for i in range(1,N-1):
    ANS=ANS*i%mod

if A!=B:
    print(ANS*((N-1)+(N-2)*(N-2))%mod)
else:
    print(ANS*(N-1)*(N-2)%mod)