#include <fstream>
#include <limits.h>
using namespace std;
int n,k,S,Max,dr,st,i,j,mid,s,nr,sol,v[16001];
int main()
{
    ifstream cin("transport.in");
    ofstream cout("transport.out");
    cin>>n>>k;
    S=0;
    Max=0;
    for(i=1;i<=n;i++){
        cin>>v[i];
        S=S+v[i];
        if(v[i]>Max)
            Max=v[i];
    }
    st=Max;
    dr=S;
    while(st<=dr){
        mid=(st+dr)/2;
        nr=1;
        s=v[1];
        for(j=2;j<=n;j++)
            if(s+v[j]<=mid)
                s=s+v[j];
            else{
                s=v[j];
                nr++;
            }
        if(nr<=k){
            sol=mid;
            dr=mid-1;
        }
        else
            st=mid+1;

    }
    cout<<sol;




    return 0;
}