#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef pair<ll, ll> p_ll;

template<class T>
void debug(T itr1, T itr2) { auto now = itr1; while(now<itr2) { cout << *now << " "; now++; } cout << endl; }
#define repr(i,from,to) for (ll i=(ll)from; i<(ll)to; i++)
#define all(vec) vec.begin(), vec.end()
#define rep(i,N) repr(i,0,N)
#define per(i,N) for (ll i=(ll)N-1; i>=0; i--)
#define popcount __builtin_popcount

const ll LLINF = (1ll<<61)-1;
const ll INF = pow(2,30)-1;

ll gcd(ll a, ll b) { if (a<b) swap(a,b); return b==0 ? a : gcd(b, a%b); }
ll lcm(ll a, ll b) { return a/gcd(a,b)*b; }

const ll MOD = 998244353;

int main() {
  ll N, X, Y; cin >> N >> X >> Y;
  if (X<Y) swap(X, Y);

  vector<ll> dp(N); dp[0] = 1;
  rep(i,N) {
    if (i+1<N) dp[i+1] = (dp[i+1] + dp[i]) % MOD;
    if (i+3<N) dp[i+3] = (dp[i+3] + dp[i]) % MOD;
  }
  // debug(all(dp));

  ll diff = Y - X;
  if (X==1) diff++;
  if (Y==N) diff++;
  ll result = diff==1 ? 0 : dp[diff-2];
  cout << result << endl;
  return 0;
}