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#include <bits/stdc++.h>
using namespace std;
// 最大上升子序列和
int n;
const int N = 100010;
int a[N];
int f[N];//以第i个元素结尾的最大子序列和
int res;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++) {
f[i] = a[i]; // 最大上升子序列（个数）这里是1,此处是a[i]
for (int j = 1; j < i; j++)
// 最大上升子序列（个数）这里是加1,此处是+a[i]
if (a[i] > a[j]) f[i] = max(f[i], f[j] + a[i]);
res = max(res, f[i]);
}
printf("%d ", res);
return 0;
