#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define N 600005
#define pb push_back
#define ff first
#define ss second
#define sz(s) (int)s.size()
ll n, t, a[N], dp[N], p[N], sum[N];
set <pair<ll,int>> ans;
int main (){
ios::sync_with_stdio(0);cin.tie(0);
cin >> n;
for(int i = 1; i <= n; i++) {
cin >> a[i];
p[i] = p[i - 1] + a[i];
}
dp[1] = 1;
sum[1] = a[1];
ans.insert({a[1],1});
for(int i = 2; i <= n; i++) {
if(a[i] >= sum[i - 1]) {
dp[i] = dp[i - 1] + 1;
sum[i] = a[i];
ans.insert({sum[i],i});
continue;
}
int ind = 0;
for(auto j : ans) {
if(j.ff <= p[i] - p[j.ss]) ind = j.ss;
else break;
}
sum[i] = p[i] - p[ind];
dp[i] = dp[ind] + 1;
ans.insert({sum[i], i});
}
cout << dp[n] << '\n';
}
