#include <fstream>
#include <cmath>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int n,suma,k,a[16001],maxim;
void citire()
{
    cin>>n>>k;
    for(int i=1;i<=n;++i)
    { cin>>a[i];
      suma+=a[i];
      maxim=max(a[i],maxim);
    }

}

int cautare(int s,int d)
{int minim=0;
    while(s<=d)
    {
        int m=(s+d)/2;

        int sum=0,ct=0;
        for(int i=1;i<=n;++i)
        {
            sum+=a[i];
            if(sum>m)
            {++ct;
             sum=a[i];
            }
            else
            if(sum==m)
            ++ct,sum=0;

            if(ct>k)break;
        }

         if(sum>0)++ct;
         if(ct<=k)
            {
             d=m-1;
             minim=m;
            }
         else s=m+1;
    }

    return minim;
}

int main()
{
 citire();
 cout<<cautare(maxim,suma);
    return 0;
}