#include <fstream>
using namespace std;

ifstream cin("transport.in");
ofstream cout("transport.out");

int v[16005];
int n,k;

bool vf(int lim){
    int s=0,cnt=1;
    for(int i=1;i<=n;i++){
        if(v[i]>lim)
            return false;
        if(s+v[i]>lim){
            s=v[i];
            cnt++;
        }
        else
            s+=v[i];
    }
    return cnt<=k;
}

int main(){
    int st=1,dr=256000000,rez,mid;
    cin>>n>>k;
    for(int i=1;i<=n;i++)
        cin>>v[i];
    rez=dr;
    while(st<=dr){
        mid=(st+dr)/2;
        if(vf(mid)){
            rez=mid;
            dr=mid-1;
        }
        else
            st=mid+1;
    }
    cout<<rez;
    return 0;
}