# include <fstream>
# define DIM 16010
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int v[DIM];
long long s,n,k,i,st,dr,mij,poz,c,nrc,h;
int main () {
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        s+=v[i];
    }
    st=1;
    dr=s/k+k;
   while(st<=dr){
        mij=(st+dr)/2;
        poz=1;
        c=0;
        nrc=1;
        h=0;
        while(nrc<=k&&v[poz]<=mij){
            c=0;
            while(c+v[poz]<=mij&&poz<=n){
                c+=v[poz];
                poz++;
                h++;
            }
            nrc++;
        }
        if(h>=n)
            dr=mij-1;
        else
            st=mij+1;
    }
    fout<<st<<"\n";
    return 0;
}