#include <bits/stdc++.h>
// #pragma GCC optimize ("Ofast,unroll-loops")
// #pragma GCC target ("avx2")
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pp;
#define er(args ...) cerr << __LINE__ << ": ", err(new istringstream(string(#args)), args), cerr << endl
#define per(i,r,l) for(int i = (r); i >= (l); i--)
#define rep(i,l,r) for(int i = (l); i < (r); i++)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define pb push_back
#define ss second
#define ff first
void err(istringstream *iss){}template<typename T,typename ...Args> void err(istringstream *iss,const T &_val, const Args&...args){string _name;*iss>>_name;if(_name.back()==',')_name.pop_back();cerr<<_name<<" = "<<_val<<", ",err(iss,args...);}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll mod = 1e9 + 7, maxn = 1e6 + 5, lg = 22, lng = 26, inf = ll(1e9) + 5;
ll pw(ll a,ll b,ll md=mod){if(!b)return 1;ll k=pw(a,b>>1ll);return k*k%md*(b&1ll?a:1)%md;}
pp dp[maxn];
int main(){
cin.tie(0) -> sync_with_stdio(0);
int n; cin >> n;
vector<ll> a(n+1);
rep(i,1,n+1) cin >> a[i];
dp[0] = {0, 0};
int ptr = 0;
ll cr = 0;
rep(i,1,n+1){
cr += a[i];
while(ptr < i-1 && cr - a[ptr+1] >= dp[ptr+1].ff) cr -= a[++ptr];
dp[i] = {cr, 1 + dp[ptr].ss};
}
cout << dp[n].ss << '\n';
return 0;
}
