#include <fstream>

using namespace std;
ifstream in("transport.in");
ofstream out("transport.out");
int v[16002],t,n;
bool verif(int k)
{
    int nr=0,c=0,i;
    for(i=1; i<=n; i++)
    {
        if(v[i]>c)
        {
            nr++;
            c=k;
        }
        if(v[i]>c) return false;
        c-=v[i];
    }
    return (nr<=t);
}
int main()
{
    int maxim=0;
    in>>n>>t;
    for(int i=1; i<=n; i++)
    {
        in>>v[i];
        if(v[i]>maxim) maxim=v[i];
    }
    while(verif(maxim)==true) maxim--;
    out<<maxim+1;
    return 0;
}