算了

suànle
  1. let it be
  2. let it pass
  3. forget about it

CEDICT

Entry Composition

1 算 suàn
  1. to regard as
  2. to figure
  3. to calculate
  4. to compute
2 了 le
  1. (completed action marker)
  2. (modal particle indicating change of state, situation now)
  3. (modal particle intensifying preceding clause)