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#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;
const int maxn = 1005;

int main() {
    ios_base::sync_with_stdio(false);
    int n;
    cin >> n;
    
    vector v(n);
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }

    map m;
    int i = 0,j = 0;
    int sum= 0, result = 0;
    while(j < n and i < n) {
        if(m[v[j]] < 1) {
            sum += v[j];
            m[v[j]]++;
            j++;
        }
        else {
            m[v[i]]--;
            sum -= v[i];
            i++;
        }
        result =max(result, sum);
    }
    return 0;
}