#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int Volum[16001],N,K;
void Read()
{
    f>>N>>K;
    int i;
    for(i=1;i<=N;i++)
        f>>Volum[i];
}
bool Check(int val)
{
    int i,partial=0,number_of_transports=0;
    for(i=1;i<=N;i++)
    {
        partial+=Volum[i];
        if(Volum[i]>val)
            return 0;
        if(partial>val)
        {
            partial=Volum[i];
            number_of_transports++;
        }
    }
    number_of_transports++;
    if(number_of_transports>K)
        return 0;
    return 1;
}
void Binary_Search()
{
    int st=1,dr=16000*16000,mid,solution=0;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(Check(mid)==1)
        {
            solution=mid;
            dr=mid-1;
        }
        else
            st=mid+1;
    }
    g<<solution<<"\n";
}
int main()
{
    Read();
    Binary_Search();
    return 0;
}