This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#define here cerr<<"===========================================\n"
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll long long
#define llinf 100000000000000000LL // 10^17
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) (ll)(a.size())
#define all(a) a.begin(),a.end()
#define ceri(a,l,r) {cerr<<#a<<": ";for(ll i_ = l;i_<=r;i_++) cerr<<a[i_]<< " ";cerr<<endl;}
#define daj_mi_malo_vremena ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
using namespace std;
using namespace __gnu_pbds;
/*
ll add(ll x,ll y){
x+=y;
if(x<0){
x%=mod;
x+=mod;
}else{
if(x>=mod) x%=mod;
}
return x;
}
ll mul(ll a,ll b){
ll ans = (a*b)%mod;
if(ans<0) ans+=mod;
return ans;
}
*/
typedef tree<int,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
typedef tree<int,null_type,less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_multiset;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll rnd(ll l,ll r){
return uniform_int_distribution<ll>(l,r)(rng);
}
#define maxn 5005
ll n;
ll a[maxn];
ll ps[maxn];
ll dpmax[maxn];
ll dp[maxn][maxn];
int main(){
daj_mi_malo_vremena
cin >> n;
for(ll i = 1;i<=n;i++) cin >> a[i];
a[1] = 0;
for(ll l = 1;l<=n;l++){
ll j = l-1, cur = a[j];
for(ll i = 0;i<=l;i++) dpmax[i] = max(dpmax[i-1],dp[i][l]);
ll delta = 0;
ll len = 0;
for(ll r = l+1;r<=n+1;r++){
dp[l][r] = dp[l][r-1];
len+=a[r-1];
while(j>1&&cur<len)j--,cur+=a[j];
if(cur==len){
if(j>1) delta++;
dp[l][r] = max(dp[l][r],dpmax[j-1]+delta);
}
}
}
ll ans = 0;
for(ll i = 1;i<=n;i++) ans = max(ans,dp[i][n]);
cout<<ans<<endl;
return 0;
}
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