#include <stdio.h>

int main () {
  int n = 0;
  int a = 0;
  int b = 0;
  
  int res = 0;
  
  long long ans = 0LL;
  long long fact = 1LL;
  long long mod_num = 998244353LL;
  
  res = scanf("%d", &n);
  res = scanf("%d", &a);
  res = scanf("%d", &b);
  
  for (int i = 0; i < n-2; i++) {
    fact *= (long long)(i+1);
    fact %= mod_num;
  }
  
  if (a != b) {
    ans += fact;
  }
  
  fact *= (long long)(n-1);
  fact %= mod_num;
  ans += (mod_num-fact)*2LL;
  ans += fact*((long long)n);
  
  printf("%lld\n", ans%mod_num);
  return 0;
}