#include <bits/stdc++.h>

using namespace std;
int n,maxi,mini,st,k,dr,a[16001];
int numar(int x)
{
    int i=1,t=0,sum=0;
    while(i<=n)
    {
        sum=0;
        while(sum+a[i]<=x&&i<=n)
        {
            sum+=a[i];
            i++;
        }
        t++;

    }
    return t;
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    scanf("%d",&a[1]);
    mini=a[1];
    maxi=a[1];
    int i;
    for(i=2; i<=n; i++)
    {
        scanf("%d",&a[i]);
        maxi=max(maxi,a[i]);
        mini+=a[i];

    }
    st=maxi;
    dr=mini;
    int rasp,mijloc,x;
    rasp= 16000;
    while(dr-st>1)
    {
        mijloc=st+(dr-st)/2;
        x=numar(mijloc);
        if(x>k) st=mijloc;
        else
        {
            dr=mijloc;
            rasp=mijloc;
            while(mijloc)
            {
                mijloc--;
                x=numar(mijloc);
                if(x<=k)rasp=mijloc;
                else break;


            }
            break;

        }


    }
    st=maxi;
    dr=x;

    printf("%d",rasp);
    return 0;
}