#include <fstream>
using namespace std;

ifstream fin("transport.in");
ofstream fout("transport.out");

int n,m,s,c,tr,cc,st,dr,k,i,v[16001];

int main(){

    fin>>n>>k;
    m=0;
    s=0;
    for(i=1;i<=n;i++){
        fin>>v[i];
        if(v[i]>m)
            m=v[i];
        s+=v[i];
    }

    st=m; dr=s;

    while(st<=dr){
        c=(st+dr)/2;
        cc=c-v[1];
        tr=1;
        for(i=2;i<=n;i++){
            if(cc>=v[i])
                cc-=v[i];
            else{
                tr++;
                cc=c-v[i];
            }
        }
        if(tr>k)
            st=c+1;
        else
            dr=c-1;
    }

    fout<<st;

    return 0;
}