#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int n, v[16006], k;

int bini(int dr, int st,int v[], int x)
{
    int elem, i, t, m ;
    m = (st + dr) / 2;
    while(st <= dr)
    {   m = (st + dr) / 2;
        t = 1; int s = 0;
        for(i = 1; i <= n;i ++)
            if(s + v[i] <= m)
            s = s + v[i];
        else
        {
            t++;
            s = v[i];
        }
        if( t > x)
            st = m + 1;
        else
        {
            elem = m;
            dr = m - 1;
        }
    }
    return elem;
}

int main()
{
    int  i, mini = 0, sum = 0, cm;
    cin >> n >> k;
    for(i = 1; i <= n; i++)
    {
        cin >> v[i];
        if(v[i] > mini)
            mini = v[i];
            sum = sum + v[i];
    }

cout << bini(sum, mini, v, k);

    return 0;
}