#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<long long> VL;
typedef vector<vector<long long>> VVL;
typedef pair<int,int> Pair;
typedef tuple<int,int,int> tpl;

#define ALL(a)  (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define REVERSE(c) reverse((c).begin(),(c).end())
#define EXIST(m,v) (m).find((v)) != (m).end()
#define LB(a,x) lower_bound((a).begin(), (a).end(), x) - (a).begin()
#define UB(a,x) upper_bound((a).begin(), (a).end(), x) - (a).begin()

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define RFOR(i,a,b) for(int i=(a)-1;i>=(b);--i)
#define RREP(i,n) RFOR(i,n,0)

#define en "\n"

constexpr double EPS = 1e-9;
constexpr double PI  = 3.1415926535897932;
constexpr int INF = 2147483647;
constexpr long long LINF = 1LL<<60;
constexpr long long MOD =  998244353; // 1000000007;

template<class T> inline bool chmax(T& a, T b){if(a<b){a=b;return true;}return false;}
template<class T> inline bool chmin(T& a, T b){if(a>b){a=b;return true;}return false;}

int f(Pair a){
    return a.second - a.first;
}

void Main(){
    int N; cin >> N;
    
    auto cmp = [](Pair a, Pair b){
        int la = a.second - a.first, lb = b.second - b.first;
        return la < lb;
    };
    priority_queue<Pair, vector<Pair>, decltype(cmp)> q(cmp);
    q.emplace(0,200200);

    set<int> st{0};
    auto get_val = [&](int a){
        auto it = st.lower_bound(a);
        if(it != st.end()){
            if(a == *it) return 0;
        }
        it--;
        return a - *it;
    };

    int ans = 0;
    REP(i,N){
        int a; cin >> a;
        int K = get_val(a);
        if(K == 0) continue;

        vector<Pair> v;
        while(!q.empty() and f(q.top())>K){
            Pair p = q.top(); q.pop();
            v.push_back(p);
        }
        for(auto& [fi, se] : v){
            q.emplace(fi, fi+K);
            q.emplace(fi+K, se);
            st.insert(fi+K);
        }
        ans++;
    }

    cout << ans << en;
    return;
}

int main(void){
    cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);cout<<fixed<<setprecision(15);
    int t=1; //cin>>t;
    while(t--) Main();
    return 0;
}