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

using Mint = atcoder::modint998244353;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int N, X, Y;
    cin >> N >> X >> Y;
    if(X>Y) swap(X, Y);
    if(X != 1) ++X;
    if(Y != N) --Y;
    int D = Y - X;
    if(D < 0)
    {
        cout << 0 << endl;
    }
    else
    {
        vector<Mint> DP(max(3, D+1));
        DP[0] = 1; DP[1] = 1; DP[2] = 1;
        for(int i=3; i<=D; ++i) DP[i] = DP[i-1]+DP[i-3];
        cout << DP[D].val() << endl;
    }
}