#include <fstream>
#define INF 260000000
using namespace std;
ifstream cin("transport.in");
ofstream cout("transport.out");
int n,k,s[16005];
bool verif(int g){
    int c=0,vf=n;
    while(c<=k){
        int st=1,dr=vf,poz=-1;
        while(st<=dr){
            int mid=(st+dr)/2;
            if(s[vf]-s[mid-1]<=g)
                dr=mid-1,poz=mid;
            else
                st=mid+1;
        }
        if(poz==-1)
            return 0;
        vf=poz-1;
        c++;
        if(vf==0&&c<=k)
            return 1;
    }
    return 0;
}
int main()
{
    cin>>n>>k;
    for(int i=1;i<=n;i++){
        cin>>s[i];
        s[i]+=s[i-1];
    }
    int st=0,dr=INF,sol=0;
    while(st<=dr){
        int mid=(st+dr)/2;
        if(verif(mid))
            dr=mid-1,sol=mid;
        else
            st=mid+1;
    }
    cout<<sol;
    return 0;
}