let div x p =
  let x0 = x / p in
  x0, x- x0 * p

let trans n m l =
  let dl = div l 25 in
  let dm = div ((fst dl) + m) 4 in
  let dn = div ((fst dm) + n) 10 in
  (snd dl) + (snd dm) + (snd dn)

let () =
  let trans1 = Scanf.sscanf (read_line ()) "%d" trans in
  let trans2 = Scanf.sscanf (read_line ()) "%d" trans1 in
  let result = Scanf.sscanf (read_line ()) "%d" trans2 in
  print_int result;
  print_newline ()