#include <stdio.h>

int v[16001];
int n, k;

int ok(int num)
{
    int tr=0,s=0,i;
    for (i=0;i<n;i++)
    {
        if (v[i]>num)
            return 0;
        s=s+v[i];
        if (s>num)
        {
            tr++;
            s=v[i];
        }
    }
    if (s>0)
        tr++;
    return tr<=k;
}

int bs(int dr)
{
    int med,last,st;
    last=dr+1;
    st=1;
    while(st<=dr)
    {
        med=dr-((dr-st)>>1);
        if(ok(med)!=0)
        {
            last=med;
            dr=med-1;
        }
        else
            st=med+1;
    }
    return last;
}

int main()
{
    FILE *f1,*f2;
    int i,s=0;
    f1=fopen("transport.in","r");
    fscanf(f1,"%d%d",&n,&k);
    for (i=0; i<n;i++)
    {
        fscanf(f1,"%d",&v[i]);
        s=s+v[i];
    }
    fclose(f1);
    f2=fopen("transport.out","w");
    fprintf(f1,"%d",bs(s));
    fclose(f2);
    return 0;
}