var f,g:text;
    s,m,n,k,i,p:longint;
    a:array[1..16000]of integer;
    e:boolean;

begin
assign(f,'transport.in');
reset(f);
readln(f,n,k);
for i:=1 to n do begin
   read(f,a[i]);
   s:=s+a[i];
   if a[i]>m then m:=a[i];
end;
s:=s div k;
if s<m then s:=m;
e:=true;
while e do begin
   m:=0;
   p:=1;
   for i:=1 to n do
      if m+a[i]>s then begin
                       p:=p+1;
                       m:=a[i];
                       end
                  else m:=m+a[i];
   e:=p>k;
   if e then s:=s+p-k;
end;
assign(g,'transport.out');
rewrite(g);
write(g,s);
close(g);
end.