#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k;
int v[16005];
bool verif(int C)
{
    int s=0,i,pasi=0;
    for(i=1;i<=n;i++)
    {
        if(v[i]>C || pasi>k) return 0;
        if(s+v[i]<=C) s+=v[i];
        else
        {
            pasi++;
            s=v[i];
        }
    }
    pasi++;
    if(pasi<=k) return 1;
    return 0;
}
int main()
{
    int st=1,dr=100000000,cap;
    int i;
    fin>>n>>k;
    for(i=1;i<=n;i++) fin>>v[i];
    while(st<=dr)
    {
        cap=(st+dr)/2;
        if(verif(cap)==1) dr=cap-1;
        else st=cap+1;
    }
    fout<<st;
}