#include <fstream>
#include <algorithm>
#include <climits>;
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,k,v[16005],i,l=1,r=256000,mid,sol;
int nrTrans(int c)
{
    int sum=v[1],cnt=1;
    for(i=2;i<=n;i++)
    {
        if(sum+v[i]<=c)
        {
            sum+=v[i];
        }
        else
        {
            sum=v[i];
            cnt++;
        }
    }
    return cnt;
}
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        l=max(l, v[i]);
    }
    while(l<=r)
    {
        mid=(l+r)/2;
        if(nrTrans(mid)>k)
        {
            l=mid+1;
        }
        else
        {
            sol=mid;
            r=mid-1;
        }
    }
    fout<<sol;
    return 0;
}