#include <bits/stdc++.h>
using namespace std;
#define u_map unordered_map
#define u_set unordered_set
#define u_multiset unordered_multiset
using ll = long long;
using vvi = vector<vector<int>>;
using vi = vector<int>;
using vvll = vector<vector<long long>>;
using vll = vector<long long>;
using vd = vector<double>;
using vvd = vector<vector<double>>;
using pii = pair<int, int>;
using vpii = vector<pair<int, int>>;
template<typename C> struct rge{C l, r;};
template<typename C> rge<C> range(C i, C j) { return rge<C>{i, j}; }
template<typename C> ostream& operator<<(ostream &os, rge<C> &r) { os << '{'; for(auto it = r.l; it != r.r; it++) os << "," + (it == r.l) << *it; os << '}'; return os; }
template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '{' << p.first << "," << p.second << '}'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ","; return os << '}'; }
void dbg_out() { cerr << ']' << endl; }
template<typename A> void dbg_out(A H) { cerr << H; dbg_out(); }
template<typename A, typename B, typename... C> void dbg_out(A H, B G, C... T) { cerr << H << ","; dbg_out(G, T...); }
#ifdef DEBUG
#define debug(...) cerr << "[" << #__VA_ARGS__ << "] = [", dbg_out(__VA_ARGS__)
#else
#define debug(...)
#endif
void solve(){
int n;
cin >> n;
vll v(n);
for(int i = 0; i < n; i++) cin >> v[i];
vll dp(n+1, 1e9);
vll sum(n+1, 1e9);
dp[0] = 0;
sum[0] = 0;
for(int i = 1; i <= n; i++){
ll suf = 0;
for(int j = i-1; j >= 0; j--){
suf += v[j];
if(suf < sum[i] && suf >= sum[j]) {
assert(dp[i] >= dp[j] + 1);
dp[i] = dp[j] + 1;
sum[i] = suf;
}
}
}
debug(dp);
debug(sum);
cout << dp[n] << endl;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
solve();
return 0;
}
