#include <fstream>
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int v[16005],n,i,k,t,r,mid;
int verif(int v[],int n,int suma)
{
    int i,p=1,s=0;
    for(i=1; i<=n; ++i)
    {
        s+=v[i];
        if(s>suma)
        {
            p++;
            s=v[i];
        }
    }
    if(p<=k) return 1;
    else return 0;
}
int main()
{
    cin>>n>>k;
    for(i=1; i<=n; ++i)
    {
        cin>>v[i];
        t+=v[i];
    }
    int st=1,dr=t;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(verif(v,n,mid))
        {
            r=mid;
            dr=mid-1;
        }
        else st=mid+1;
    }
    cout<<r;
    return 0;
}