#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int i,j,n,m,k,nr,s,v[16001],st,dr,p;
int main()
{
    f>>n>>k;
    for(i=1;i<=n;i++)
        {
            f>>v[i];
            s+=v[i];
        }
    st=s/k;
    dr=s;
    s=0;
    while(st<dr)
    {
        m=st+(dr-st)/2;
        nr=0;
        p=1;
        while(nr<=k&&p<=n)
        {
            s=v[p];
            while(s<=m&&p<=n)
            {
                p++;
                s+=v[p];
            }
            nr++;
        }
        if(nr<=k)
            dr=m-1;
        else st=m+1;
    }
    g<<st;
    return 0;
}