#include "testlib.h"
#include <bits/stdc++.h>
#define mod 998244353

using namespace std;

int main(int argc, char* argv[]){
  registerValidation(argc, argv);

  long long n=inf.readLong(2ll,200000ll);inf.readEoln();
  vector<long long> a=inf.readLongs(n,1ll,1000000000ll);inf.readEoln();
  inf.readEof();
  map<long long,long long> dp;
  for(int i=0;i<n;i++){
    dp[a[i]]++;
    dp[a[i]]+=dp[a[i]-1];
    dp[a[i]]%=mod;
  }
  long long res=0;
  for(auto &nx : dp){
    res+=nx.second;res%=mod;
  }
  res+=(mod-n);res%=mod;
  cout << res << "\n";
  return 0;
}