#pragma GCC optimize("O3")
#include<bits/stdc++.h>
using namespace std;

const int M = 998244353;
const long long LM = 1LL << 60;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    int n;
    // n = 200000;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        // a[i] = i + 1;
        cin >> a[i];
    }
    vector<vector<int>> vv;
    int SQ = 500;

    vector<int> v = { 0, 200010 };
    int ans = 0;
    for (int i = 0; i < n; ++i) {
        for (auto& x : vv) {
            a[i] -= *prev(upper_bound(x.begin(), x.end(), a[i]));
        }
        a[i] -= *prev(upper_bound(v.begin(), v.end(), a[i]));
        if (a[i] > 0) {
            ++ans;
            vector<int> nex;
            for (int j = 0; j < (int)v.size(); ++j) {
                nex.push_back(v[j]);
                if (j + 1 < (int)v.size() && v[j] + a[i] < v[j + 1]) {
                    nex.push_back(v[j] + a[i]);
                }
            }
            v = nex;
        }
        if ((i + 1) % SQ == 0) {
            vv.push_back(v);
            v = { 0, 200010 };
        }
    }
    cout << ans << '\n';
    return 0;
}