#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

bool less(int a,int b)
{ return a>b; }

int main()
{
    vector<int> vec(1024);
    vector<double> sum(1024);;
    int num;
    int n,i,j;

    while(cin>>n,n)
    {
        sum.assign(1024,0);
        for(i=0;i<n;i++)
        {
            cin>>num;
            vec.push_back(num);
        }
        sum[0] += vec[0];
        for(j=0,i=1;i<n;i++)
        {
            if(vec[i]>vec[i-1])
               sum[j] += vec[i];
            else{
                j++;
                sum[j] += vec[i];
            }
        }
        sort(sum.begin(),sum.end(),less);
        cout<<sum[0]<<endl;
        sum.clear();
        vec.clear();
    }
    return 0;
}

求助啊