#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair <int, int>
#define fi first
#define se second
#define mp make_pair
#define isz(a) (int)(a).size()
const int NM = 5e5;
int N, a[NM+5], pref[NM+5], trace[NM+5];
pii dp[NM+5];
vector <int> v;
void add(int x){
while (!v.empty() && pref[v.back()]+dp[v.back()].se >= pref[x]+dp[x].se) v.pop_back();
v.push_back(x);
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> N;
for (int i = 1; i <= N; i++){
cin >> a[i];
pref[i] = pref[i-1]+a[i];
}
add(0);
for (int i = 1; i <= N; i++){
int l = 0, r = isz(v)-1;
while (l <= r){
int mid = (l+r)/2;
if (pref[i] >= pref[v[mid]]+dp[v[mid]].se){
dp[i].fi = dp[v[mid]].fi+1;
dp[i].se = pref[i]-pref[v[mid]];
l = mid+1;
}
else r = mid-1;
}
add(i);
}
cout << dp[N].fi;
return 0;
}
