#include <bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 1e18;
const int N = 2e5 + 5;
int a[N], dp[N][2], pr[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];
pr[i] = pr[i - 1] + a[i];
dp[i][0] = -1;
dp[i][1] = INF;
}
dp[1][0] = 1;
dp[1][1] = a[1];
for(int i = 2; i <= n; i++){
for(int j = i; j >= 0; j--){
int sum = pr[i] - pr[j];
if(dp[j][1] + pr[j] <= pr[i]){
dp[i][1] = min(dp[i][1], sum);
dp[i][0] = dp[j][0] + 1;
break;
}
}
}
cout << dp[n][0] << endl;
}
