#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int n, k, v[16001];
    cin>>n>>k;
    int st=-1, dr=0;
    for(int i = 1; i <= n; i++) {
        cin>>v[i];
        if(v[i]>st){
            st=v[i];
        }
        dr=dr+v[i];
    }
    int sol = -1;
    while(st<=dr) {
        int m=(st+dr)/2;
        int nrt=1;
        int s=0;
        for(int i=1;i<=n;i++){
            if(s+v[i]<=m){
                s=s+v[i];
            }
            else{
                s=v[i];
                nrt++;
            }
        }
        if(nrt>k){
            st=m+1;
        }
        else{
            sol=m;
            dr=m-1;
        }
    }
    fout<<sol;
    return 0;
}