#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>
#define LP pair<ll, ll>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define all(s) s.begin(), s.end()
#define rall(s) s.rbegin(), s.rend()
template<class T>
void chmax(T& a, T b) { a = max(a, b); };
template<class T>
void chmin(T& a, T b) { a = min(a, b); };
using mint = modint998244353;

int main() {
  int n, x, y;
  cin >> n >> x >> y;
  if (x > y) swap(x,y);
  if (y-1==x) {
    cout << 0 << endl;
    return 0;
  }
  int d = y-1-(x+1)+1;
  if (x == 1) d++;
  if (y == n) d++;
  vector dp(n+1, vector<mint>(2));
  dp[1][0] = 1;
  for (int i = 1; i < n; i++) {
    dp[i+1][0] = dp[i][0]+dp[i][1];
    dp[i+1][1] = dp[i-1][0];
  }
  cout << dp[d][0].val() << endl;
  
  return 0;
}