#include <bits/stdc++.h> #include <atcoder/all> using namespace std; using namespace atcoder; #define rep(i, n) for(int i=0;i<(n);++i) #define rep1(i, n) for(int i=1;i<=(n);i++) #define ll long long using mint = modint998244353; using P = pair<ll,ll>; using lb = long double; using T = tuple<ll, ll, ll>; #ifdef LOCAL # include <debug_print.hpp> # define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__) #else # define dbg(...) (static_cast<void>(0)) #endif int main() { int n; cin >> n; vector<int> a(n); rep(i,n) cin >> a[i]; int m = 1e5; vector<mint> dp(m+1); rep(i,m+1){ if(i+a[0]<=m) dp[i] = 1; } for(int i=1;i<n;i++){ vector<mint> sum(m+2); rep(j,m+1) sum[j+1] = sum[j] + dp[j]; vector<mint> p(m+1); swap(dp, p); rep(j,m+1){ if(j+a[i]>m) break; int b = min(j + a[i] - a[i-1], j); if(b<0) continue; dp[j] += sum[b+1]; } // rep(j,10) dbg(dp[j].val()); } mint ans = 0; rep(j,m+1) ans += dp[j]; cout << ans.val() << endl; return 0; }