#include <bits/stdc++.h>
#define int64_t int
const int N = 5e6 + 15;
std::pair<int, int> t[N];
std::vector<int> ll(N), rr(N);
std::pair<int, int> neutral = {-1, -1};
const int64_t MAXN = 1e15;
struct implicit {
int idxx = 1;
implicit() {
for (int i = 0; i < N; i++) {
t[i] = neutral;
}
}
void update(int node, int tl, int tr, int index, std::pair<int, int> value) {
if (tl == tr) {
t[node] = value;
return;
}
int tm = (tl + tr) / 2;
if (index <= tm) {
if (!ll[node]) ll[node] = ++idxx;
update(ll[node], tl, tm, index, value);
} else {
if (!rr[node]) rr[node] = ++idxx;
update(rr[node], tm + 1, tr, index, value);
}
t[node] = std::max((ll[node] ? t[ll[node]] : neutral), (rr[node] ? t[rr[node]] : neutral));
}
std::pair<int, int> query(int node, int tl, int tr, int l, int r) {
if (l > tr || r < tl) return neutral;
if (l <= tl && tr <= r) return t[node];
int tm = (tl + tr) / 2;
std::pair<int, int> ans = neutral;
ans = std::max(ans, query(ll[node], tl, tm, l, r));
ans = std::max(ans, query(rr[node], tm + 1, tr, l, r));
return ans;
}
} seg;
void solve() {
int n;
std::cin >> n;
std::vector<int64_t> a(n + 1);
for(int i = 1; i <= n; i++) {
std::cin >> a[i];
}
std::vector<int64_t> pref(n + 1);
for(int i = 1; i <= n; i++) {
pref[i] = pref[i - 1] + a[i];
}
std::vector<std::pair<int,int>> dp(n + 1, {- 1, - 1});
dp[0] = {0, 0};
for(int i = 1; i <= n; i++) {
for(int j = i - 1; j >= 0; j--) {
if(pref[i] >= pref[j] + dp[j].second) {
dp[i] = std::max(dp[i], {dp[j].first + 1, dp[j].second});
}
}
if(dp[i].first == - 1) {
dp[i].first = dp[i - 1].first;
dp[i].second = dp[i - 1].second + a[i];
}
else {
dp[i].second = pref[i] - dp[i].second;
}
}
std::cout << dp[n].first;
}
signed main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int t = 1;
//std::cin >> t;
while (t--) {
solve();
}
return 0;
}
