from itertools import permutations


mod=998244353

n,k,x=map(int,input().split())
if n>10:
  raise Exception

Ps=list(permutations(list(range(1,n+1)),n))
res=0
for i in range(len(Ps)):
  if Ps[i][k-1]==x:
    res+=i

print(res%mod)