#include <fstream>

using namespace std;
int v[16005];
ifstream cin("transport.in");
ofstream cout("transport.out");
int main()
{
    int n,k,a;
    cin >> n >> k;
    int st=1,dr=256000000,mij;
    for(int i=0; i<n; i++)
    {
        cin >> a;
        v[i]=a;
    }
    int ca=k,s=0,last;
    while(st<=dr)
    {
        k=ca-1;
        mij=st+(dr-st)/2;
        s=0;
        for(int i=0; i<n; i++)
        {
            s+=v[i];
            if(s>mij)
            {
                k--;
                s=v[i];
            }
        }
        if(k>=0)
        {
            dr=mij-1;
            last=mij;
        }
        if(k<0)
            st=mij+1;
    }
    cout << last;
    return 0;
}