#include <iostream>
#include <fstream>

using namespace std;

int n,k,x[16005],s,mij,in,sf,c;

int main()
{
    int i,j,mx=0,mn=16005;
    FILE *f=fopen("transport.in","r");
    FILE *g=fopen("transport.out","w");
    fscanf(f,"%d %d",&n,&k);
    for(i=1;i<=n;i++)
    {
        fscanf(f,"%d",&x[i]);
        s+=x[i];
        mx=max(mx,x[i]);
    }
    int in=mx,sf=s;
    while(in<=sf)
    {
        mij=in+(sf-in)/2;
        s=0;
        c=1;
        for(i=1;i<=n;i++)
        {
            s+=x[i];
            if(s>mij)
            {
                s=x[i];
                c++;
            }
        }
        if(c<=k)
        {
            sf=mij-1;
            mn=mij;
        }
        else
        {
            in=mij+1;
            mn=mij;
        }
    }
    fprintf(g,"%d\n",mn);
    return 0;
}