好好好好好好好好题！！！！

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=510,P=998244353;
int a[N],dp[N][N];
signed main()
{
	int n;cin>>n;
	for(int i=1;i<=n;i++)cin>>a[i];
	for(int i=1;i<=n;i++)dp[i][i]=1;
	for(int k=1;k<=n;k++)for(int l=1;l+k<=n;l++)
	{
		int r=l+k;
		for(int i=l+1;i<=r;i++)if(i==r||a[l+1]<=a[i+1])
			dp[l][r]=(dp[l][r]+dp[l+1][i]*dp[i][r])%P;
	}
	cout<<dp[1][n];
	return 0;
}