#include<stdio.h>
using namespace std;
int n,k,sol;
int v[16001];
bool ok(int Camion)
{
    int cnt, i, s;

    s = 1000000001; cnt=0;

    for (i=1; i<=n; i++)
    {
        if (v[i] > Camion) return 0;
        if (s+v[i] <= Camion)
        {

            s += v[i];
        }
        else
        {
            cnt++;
            s = v[i];

        }
    }
    if (cnt > k) return 0;
    return 1;
}
int main()
{
    freopen("transport.in","r",stdin);
    freopen("transport.out","w",stdout);
    scanf("%d %d",&n,&k);
    for(int i=0; i<n; i++) scanf("%d",&v[i]);
    int pas=1<<16,start=0;
    for(pas; pas>0; pas=pas>>1)
    {
        if(!ok(start+pas)) start+=pas;
        else sol=start+pas;
    }
    printf("%d",sol);
}