#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int n;
cin>>n;
vector<int>arr(n);
for(int i=0;i<n;i++){
cin>>arr[i];
}
int k;
cin>>k;
int sum;
int x=n*(n+1)/2;
vector<int>tem(x);
for(int i=0;i<n;i++){
sum=0;
for(int j=i;j<n;j++){
sum+=arr[j];
tem.push_back(sum);
}
}
sort(tem.begin(),tem.end());
cout<<tem[x-k];
return 0;
}
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