//#include <fstream>
#include<iostream>
using namespace std;
int a, b, c, d, v[16001], k=0, m, lm;
int z(int lm, int m)
{
    int n=1;
    while(n<m)
    {
        a=(n+m)/2;
        int nr = 0;
        int cap = 0;
        for(int i=0;i < lm;i++)
        {
            if(cap + v[i] > a)
            {
                nr++;
                cap = v[i];
            }
            else
                cap = cap + v[i];
        }
        if(nr<=d)
            m=a-1;
        else
            n=a+1;
        k=0;
    }
    return n+2;
}
int main()
{
    ifstream cin ("transport.in");
    ofstream cout ("transport.out");
    int s=0;
    cin>>m>>d;
    for(int i=0;i<m;i++)
    {
        cin>>v[i];
        s+=v[i];
    }
    b=z(m, s);
    cout<<b;
    return 0;
}