#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)
#define Inf 1000000001


int main(){
	
	int n,x,y;
	cin>>n>>x>>y;
	if(x>y)swap(x,y);
	if(x!=1)x++;
	if(y!=n)y--;
	vector<mint> dp(n+5,0);
	dp[0] = 1;
	dp[1] = 1;
	dp[2] = 1;
	for(int i=3;i<n+5;i++){
		dp[i] = dp[i-1] + dp[i-3];
	}
	
	if(y-x<0)cout<<0<<endl;
	else cout<<dp[y-x].val()<<endl;
	
	return 0;
}