#include <fstream>
#include <iostream>
int a[16001];

using namespace std;

int main()
{

ifstream cin("transport.in");
ofstream cout("transport.out");
   int n,k,max1=-1;
   cin>>n>>k;
   long long s;
   for(int i=1; i<=n; i++ ){
    cin>>a[i];
    s=s+a[i];
    if(max1<a[i]) max1=a[i];
   }
   int st=max1,raspuns=-1;
   long long dr=s;
    while(st<=dr){
        int mij=(st+dr)/2;

       int s1=0,cnt=1;
    for(int i=1; i<=n;i++){
        if(s1+a[i]<=mij) s1=s1+a[i];
        else {
            s1=a[i];
            cnt++;
        }
    }
        if(cnt<=k){
            raspuns=mij;
            dr=mij-1;
        }
        else st=mij+1;


    }
    cout<<raspuns;
    return 0;
}