include <bits/stdc++.h>

using namespace std;

define N int(1e5)

int main()
{
freopen("DAYSO.inp","r",stdin);
freopen("DAYSO.out","w",stdout);
int n,a[N];cin>>n;
for(int i=0;i<n;i++) cin>>a[i];
int max_sum= INT_MIN;
for(int i=0;i<=n;i++){
for(int j=i;j<=n;j++){
if(a[i]==a[j]){
int tong_sum=0;
for(int k=i;k<=j;k++){
tong_sum+=a[k];
}
max_sum=max(tong_sum,max_sum);
}
}
}
cout<<max_sum;
}