#include<iostream>
#include<stdio.h>
using namespace std;
int v[16001];
int main(){
    int maxi=0,s=0,n,k,i,l1,l2,pp,m,c=0,cm;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    cin>>n>>k;
    for(i=1;i<=n;i++){
        cin>>v[i];
        if(v[i]>maxi)
            maxi=v[i];
        s=s+v[i];
    }
    l1=maxi;
    l2=s;
    pp=0;
    while(l1<l2&&pp==0){
        m=(l1+l2)/2;
        c=1;
        cm=m;
        for(i=1;i<=n;i++){
            if(cm>v[i])
                cm=cm-v[i];
            else{
                cm=m;
                cm=cm-v[i];
                c++;
            }
        }
        if(c<k)
            l2=m-1;
        if(c>k)
            l1=m+1;
        if(c==k)
            pp=m;
    }
    cout<<m;
    return 0;
}