#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define int long long
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
const int E = 5e5+777;
const long long inf = 1e18+777;
const int N = 3e3+777;
const int MOD = 1e9+7;
int n, a[E], pref[E], dp[E], w[E];
int get(int l, int r){
if(l == -1 || r == -1) return -inf;
return pref[r] - pref[l-1];
}
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];
}
int ans = 1, last = a[1];
for(int i = 2; i <= n; ++i){
int L = 1, R = n, res = -1;
while(L <= R){
int M = (L + R) >> 1LL;
if(last <= get(i, M)){
R = (res = M) - 1;
}else L = M + 1;
}
if(last <= get(i, res)){
++ans;
}else break;
int k = i;
for(; k < res; ++k){
if(last + k <= get(k+1, res)){
last += k;
}else break;
}
last = get(k, res);
i = res;
}
cout << ans;
}
