#include<fstream>
using namespace std;
int v[16005];
int n,k;
 bool verificare(int capacitate) {
    int suma=0;
    int camioane=1;
    for(int i=1;i<=n;++i)
    {
       if(suma+v[i]<=capacitate){
        suma+=v[i];
       }
        else{
            suma=v[i];
            ++camioane;
        }
    }
    return camioane<=k;
}

int main()
{
    ifstream cin("transport.in");
    ofstream cout("transport.out");
    int max=0,s=0;
    cin>>n>>k;
    for(int i=1;i<=n;++i)
    {
        cin>>v[i];
        s+=v[i];
        if(v[i]>max)
            max=v[i];
    }
    int st=max,dr=s,ans;
    if(k==n)
    {
        cout<<max;
        return 0;
    }
    else{
    while(st<dr)
    {
        int mij=(st+dr)/2;
        if(verificare(mij)==1)
        {
            ans=mij;
            dr=mij;
        }
        else
            st=mij+1;
        mij=(st+dr)/2;
    }
    cout<<ans;
    return 0;
    }
}