#include "bits/stdc++.h"
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define deb(...)
#endif
const int N = 5e5 + 5;
int a[N], f[N];
long long pref[N];
pair<int, long long> dp[N];
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
for (int i = 1; i <= n; ++i) {
cin >> a[i];
pref[i] = pref[i - 1] + a[i];
}
dp[1] = {1, a[1]};
f[1] = 1;
for (int i = 2; i <= n; ++i) {
int l = f[dp[i - 1].first] - 1, r = i - 1;
while (l < r) {
int mid = (l + r + 1) / 2;
if (dp[mid].second + pref[mid] <= pref[i]) {
l = mid;
} else {
r = mid - 1;
}
}
if (l < f[dp[i - 1].first]) {
dp[i] = dp[i - 1];
dp[i].second += a[i];
} else {
dp[i].first = dp[l].first + 1;
dp[i].second = pref[i] - pref[l];
f[dp[i].first] = i;
}
}
cout << dp[n].first << '\n';
return 0;
}
