#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using T = tuple<ll, ll, ll>;
#define int long long
#define Base 41
#define sz(a) (int)a.size()
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define all(x) x.begin() , x.end()
#define pii pair<int , int>
#define fi first
#define se second
#define Lg(x) 31 - __builtin_clz(x)
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 5e5 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void setupIO(){
#define name "Whisper"
//Phu Trong from Nguyen Tat Thanh High School for gifted student
srand(time(NULL));
cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
//freopen(name".inp", "r", stdin);
//freopen(name".out", "w", stdout);
cout << fixed << setprecision(10);
}
template <class X, class Y>
bool minimize(X &x, const Y &y){
X eps = 1e-9;
if (x > y + eps) {x = y; return 1;}
return 0;
}
template <class X, class Y>
bool maximize(X &x, const Y &y){
X eps = 1e-9;
if (x + eps < y) {x = y; return 1;}
return 0;
}
int N;
int a[MAX];
pii dp[MAX];
int s[MAX];
vector<int> best;
void Add(int x){
while (best.size() && dp[best.back()].se + s[best.back()] >= dp[x].se + s[x]){
best.pop_back();
}
best.push_back(x);
}
void Whisper(){
cin >> N;
for (int i = 1; i <= N; ++i) cin >> a[i], s[i] = s[i - 1] + a[i];
//s(i) - s(j) >= s(j) - s(x)
//-> s(i) >= 2 * s(j) - s(x)
Add(0);
for (int i = 1; i <= N; ++i){
int l = 0, r = sz(best) - 1;
while (l <= r){
int mid = (l + r) >> 1;
int x = best[mid];
if (s[i] >= s[x] + dp[x].se){
dp[i].fi = dp[x].fi + 1;
dp[i].se = (s[i] - s[x]);
l = mid + 1;
}
else r = mid - 1;
}
Add(i);
}
cout << dp[N].fi;
}
signed main(){
setupIO();
int Test = 1;
// cin >> Test;
for ( int i = 1 ; i <= Test ; i++ ){
Whisper();
if (i < Test) cout << '\n';
}
}
