#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;
}
}
// if(i==4){
// cout<<"l = "<<l<<"\n";
// }
dp[i]={dp[l-1].x+1,pref[i]-pref[l-1]};
}
cout<<dp[n].x;
}
/**
5
6 2 3 9 13
*/
