import java.util.*;
import java.lang.*;
import java.io.*;
public class Main
{
public static void main (String[] args) throws java.lang.Exception
{
//your code here
Scanner sc=new Scanner(System.in);
int n=sc.nextInt();
int arr[]=new int[n];
for(int i=0;i<n;i++){
arr[i]=sc.nextInt();
}
int b=sc.nextInt();
int low=0;
int sum=0;
for(int i=0;i<n;i++){
if(arr[i]>low){
low=arr[i];
}
sum+=arr[i];
}
if(b==n){
System.out.print(low);
return;
}
int high=sum;
int res=0;
while(low<=high){
int mid=low+(high-low)/2;
if(isPossible(arr,n,b,mid)==true){
res=mid;
high=mid-1;
}
else{
low=mid+1;
}
}
System.out.print(res);
}
public static boolean isPossible(int arr[] , int n, int b, int mid){
int day=1;
int sum=0;
for(int i=0;i<n;i++){
sum+=arr[i];
if(sum>mid){
day++;
sum=arr[i];
}
}
return day<=b;
}
}
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