#include <fstream>
using namespace std;
ifstream f("transport.in");
ofstream g("transport.out");
int i, j, n, k, v[16005], maxi, st, dr, s, m, a, b, nr, c;
int main()
{
    f>>n>>k;
    for(i=1;i<=n;++i)
    {
        f>>v[i];
        maxi=max(maxi, v[i]);
        s+=v[i];
    }
    st=maxi;
    dr=s;
    while(st<=dr)
    {
        m=st+(dr-st)/2;
        nr=0;
        s=0;
        for(i=1;i<=n;++i)
        {
            s+=v[i];
            if(s==m) nr++, s=0;
            else if(s>m) nr++, s=v[i];
        }
        if(s) nr++;
        if(nr<=k) c=m, dr=m-1;
        else st=m+1;
    }
    g<<c<<"\n";
    return 0;
}