#include <cstdio>

using namespace std;
int v[16001];
int main()
{
    int i,med,k,n,st,dr,tr,s,ok;
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d%d",&n,&k);
    s=0;
    for(i=1;i<=n;i++)
        {
            scanf("%d",&v[i]);
            s=s+v[i];
        }
    st=1;
    dr=s;
    while(st<=dr)
    {
        s=0;
        ok=0;
        tr=0;
        med=st+(dr-st)/2;
        for(i=1;i<=n;i++)
        {
            s=s+v[i];
            if(v[i]>med)
                {
                    ok=1;
                    break;
                }
            if(s+v[i+1]>med)
                {
                    tr++;
                    s=0;
                }

        }
        if(ok==1)
            tr=k+1;
        else
            tr++;
        if(tr<=k)
            dr=med-1;
        else
            st=med+1;
    }
    printf("%d",med);

    return 0;
}