#include <bits/stdc++.h>
using namespace std;
#define x first
#define y second
#define pb push_back
#define all(a) a.begin(), a.end()
#define int long long
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<bool> vb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
const int N = 5e5 + 99;
int a[N], pref[N];
pii dp[N];
signed main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
pref[i] = pref[i - 1] + a[i];
}
dp[0] = {0, 0};
dp[1] = {1, a[1]};
for (int i = 2; i <= n; ++i) {
int l = 1, r = i;
while (l < r) {
int mid = (l + r + 1) / 2;
if (pref[i] - pref[mid - 1] < dp[mid - 1].y) {
r = mid - 1;
}
else {
l = mid;
}
}
dp[i] = {dp[l - 1].x + 1, pref[i] - pref[l - 1]};
}
cout << dp[n].x;
}
