#include <bits/stdc++.h>
using namespace std;
ifstream in ("transport.in");
ofstream out ("transport.out");
int main(void)
{
    int s=0,n,k,v[16001]={0};
    in>>n>>k;
    for (int i=1;i<=n;++i)
    {
        in>>v[i];
        s+=v[i];
    }
    int l=1,r=s,best;
    while (l<=r)
    {
        int mid=(l+r)/2,s1=0,cnt=0;
        for (int i=1;i<=n;++i)
        {
            s1+=v[i];
            if (s1==mid)
            {
                s1=0;
                cnt++;
            }
            if (s1>mid)
            {
                cnt++;
                s1=v[i];
            }
        }
        if (s1)
            cnt++;
        if (cnt<=k)
        {
            best=mid;
            r=mid-1;
        }
        else
            l=mid+1;
    }
    out<<best;
    return 0;
}