#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 Inf32 1000000001
#define Inf64 1000000000000000001


int main(){
	
	int n;
	cin>>n;
	vector<mint> dp(100001,0);
	vector<int> a(n);
	rep(i,n)cin>>a[i];
	
	for(int i=a[0];i<dp.size();i++)dp[i] = 1;
	
	for(int i=1;i<n;i++){
		vector<mint> ndp(100001,0);
		rep(j,dp.size()){
			if(dp[j]==0)continue;
			int x = a[i];
			x += j-a[i-1];
			x = max(x,j);
			if(x<dp.size())ndp[x] += dp[j];
		}
		for(int j=1;j<dp.size();j++)ndp[j] += ndp[j-1];
		
		swap(dp,ndp);
	}
	mint ans = 0;
	rep(i,dp.size())ans += dp[i];
	
	cout<<ans.val()<<endl;
	
	return 0;
}