#include <fstream>

using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int n,v[16010],k,s;
int i;
int vf(int x){
    int aux=0;
    int transp=1;
    for(i=1;i<=n;i++){
        if(v[i]>x)
            return 0;
        if(aux+v[i]>x){
            transp++;
            aux=v[i];
        }
        else
            aux=aux+v[i];
        if(transp>k)
            return 0;
    }
    return 1;
}
int main()
{
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        s+=v[i];
    }
    int st,dr,mid;
    st=1;
    dr=s;
    while(st<=dr){
        mid=(st+dr)/2;
        if(vf(mid)==1)
            dr=mid-1;
        else
            st=mid+1;
    }
    fout<<dr+1;

    return 0;
}