#include <fstream>
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");

int n, k, v[16001], c, mx, s;

int ok(int x)
{
    int l=1, s1=0;
    for(int i=0; i<n; i++)
    {
        if(s1+v[i] <= x) s1+=v[i];
        else 
        {
            l++;
            s1=v[i];
        }
    }
    return l <= k;
}

int main()
{
    int st, dr;
    fin>>n>>k;
    for(int i=0; i<n; i++){
        fin>>v[i];
        if(v[i]>mx) mx=v[i];
        s+=v[i];
    }
    st=mx;
    dr=s;
    while(st<=dr)
    {
        int m = (st + dr) / 2;
        if(ok(m)) {c=m; dr=m-1;}
        else st = m+1; 
    }
    fout << c;
    return 0;
}