1 #include<cstdio>
 2 #include<cstring>
 3 #include<algorithm>
 4 using namespace std;
 5 const int maxn=1010;
 6 int dp[maxn],p[maxn];
 7 int n;
 8 
 9 int main()
10 {
11     p[0]=-0x3f3f3f3f;
12     while(scanf("%d",&n)&&n)
13     {
14         int ans=-0x3f3f3f3f;
15         memset(dp,0,sizeof(dp));
16         for(int i=1;i<=n;i++)
17         {
18             scanf("%d",&p[i]);
19             dp[i]=p[i];
20             for(int j=0;j<i;j++)
21                 if(p[j]<p[i])
22                 {
23                     dp[i]=max(dp[i],dp[j]+p[i]);
24                     ans=max(ans,dp[i]);
25                 }
26         }
27         printf("%d\n",ans);
28 
29     }
30 }