#include "bits/stdc++.h"
#define int long long
#define all(v) v.begin() , v.end()
#define sz(a) (int)a.size()
using namespace std;
void _(){
int n; cin >> n;
int ar[n+5];
for(int i=1;i<=n;i++) cin >> ar[i];
int dp[n+5][n+5];
memset(dp,0,sizeof(dp));
for(int i=1;i<=n;i++){
for(int j=i;j<=n;j++){
// last block starts from right to left
set<int> s;
int sum = 0;
for(int z = j; z > i; z--){
sum += ar[z];
s.insert(sum);
}
int p = j + 1, cur = 0, cost = 0;
while(p <= n){
if(s.count(cur)) cost++;
cur += ar[p];
dp[j+1][p] = max(dp[j+1][p], dp[i][j] + cost);
p++;
}
// last block starts from left to right
}
}
int ans = 0;
for(int i=1;i<=n;i++) ans = max(ans, dp[i][n]);
cout << ans << '\n';
}
int32_t main(){
cin.tie(0); ios::sync_with_stdio(0);
int tc=1;//cin >> tc;
while(tc--) _();
return 0;
}
