#include <iostream>
#include<cstdio>
using namespace std;
const int L=27;
int v[16001];

int n, k, c, i;
bool sepoate(int c)
{
    int cc=c, nr=1;
    for(int i=0; i<n; i++)
    {
        if(v[i]>c)
            return false;
        if(v[i]>cc)
        {
            nr++;
            cc=c;
        }
        cc-=v[i];
        if(nr>k)
            return false;
    }
    return true;
}

int main()
{
    FILE *fin, *fout;
    int pas, r;
    fin=fopen("transport.in", "r");
    fout=fopen("transport.out", "w");
    fscanf(fin, "%d %d\n", &n, &k);
    for(i=0; i<n; i++)
        fscanf(fin, "%d\n", &v[i]);
    r=0;
    pas=1<<L;
    while(pas>0)
    {
        if(!sepoate(r+pas))
            r+=pas;
        pas/=2;
    }
    fprintf(fout, "%d", r+1);
    fclose(fin);
    fclose(fout);
    return 0;
}