#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int v[16005];
int main()
{
    int n,k;
    cin>>n>>k;
    int sum=0,maxx=0,rasp=0;
    for(int i=1;i<=n;i++){
        cin>>v[i];
        maxx=max(maxx,v[i]);
        sum=sum+v[i];
    }
    int st=maxx,dr=sum;

    while(st<=dr){
        int mid=(st+dr)/2;
        int cnt=1,s=0;
        for(int i=1;i<=n;i++){
                if(v[i]+s<=mid){
                    s+=v[i];
                }
                else{
                    s=v[i];
                    cnt++;
                }
        }
        if(cnt<=k){
            dr=mid-1;
            rasp=mid;
        }
        else{
            st=mid+1;
        }
    }
    cout<<rasp;
}