#include <fstream>
#include <stack>
int v[16001];//v de saltele
using namespace std;
ifstream fin("transport.in");
ofstream fout("transport.out");
int nrtransporturi(int n, int v[16001], int c){//cate transporturi sunt pt un anumit c
    int i, cam = 0, nrt = 1;
    for(i=1; i<=n; i++){
        if(cam+v[i] <= c)
            cam=cam+v[i];
        else{
            nrt++;
            cam=v[i];
        }
    }
    return nrt;
}
int main()
{
    int n, k, i, vmax, sumvol, st, dr,mij;
    fin>>n>>k;
    for(i=1;i<=n;i++)
        fin>>v[i];
    vmax=0;//v saltea max
    sumvol=0;
    for(i=1;i<=n;i++){
        if(v[i]>vmax)
            vmax=v[i];
        sumvol=sumvol+v[i];
    }
    st=1;
    dr=256000000;
    while(dr-st>1){
        mij=(st+dr)/2;
        if(nrtransporturi(n, v, mij)>k)
            st=mij;
        else
            dr=mij;

    }
    if(k==nrtransporturi(n, v, dr))
        fout<<dr<<endl;
    return 0;
}