////////////////////////////// Author:eldaee, coder_viper
#pragma GCC optimize ("Ofast")
#include <bits/stdc++.h>
#define int long long
#define str string
#define vec vector
#define dou double
#define ld long double
#define pb push_back
#define ppb pop_back
#define eb emplace_back
#define OK cout << "OK" << '\n'
#define Ok cout << "Ok" << '\n'
#define YES cout << "YES" << '\n'
#define Yes cout << "Yes" << '\n'
#define NO cout << "NO" << '\n'
#define No cout << "No" << '\n'
#define gcd __gcd
#define all(x) x.begin(),x.end()
#define eldaee ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
/*
*/
const int mod = 1000001;
void solve() {
int n;
cin >> n;
vector<int> v(n);
for (int i = 0; i < n; i++) {
cin >> v[i];
}
int x = 1;
int ma = 1;
for (int i = 1; i < n; i++) {
for (int j = 1; j < v[i]; j++) {
if (j <= ma) {
x = (x + 1) % mod;
}
}
if (v[i] > ma) {
ma = v[i];
}
}
cout << x % mod << '\n';
}
signed main() {
eldaee
solve();
}
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