#include <fstream>

using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int v[160001];
bool simulare(int v[], int n, int k, int vol)
{
    int i, s = 0, cnt = 1;
    for(i = 1;i <= n; i++)
    {
        if(s + v[i] <= vol)
            s += v[i];
        else
        {
            s = v[i];
            cnt++;
        }
    }
    if(cnt > k)
        return 0;
    return 1;
}
int main()
{
    int n, k, i, st = 0, dr = 16000*17000, x, m, val;
    cin>>n>>k;
    for(i = 1; i <= n; i++)
    {
        cin>>v[i];
        if(v[i]>st)
            st = v[i];
    }
    while(st<=dr)
    {
        m = (st + dr) / 2;
        if(simulare(v, n, k, m)==1)
        {
            val = m;
            dr=m-1;
        }
        else
            st=m+1;
    }
    cout<<val;
    return 0;
}