MOD = 998244353
N,a,b = map(int,input().split())
if a!=b:
    ans = N*N-3*N+3
    for i in range(N-2,1,-1):
        ans = (ans*i)%MOD
else:
    ans = N-2
    for i in range(N-1,1,-1):
        ans = (ans*i)%MOD
print(ans)