for any keystroke n , we will need to choose between : - 1. pressing Ctrl - V once after copying the A ' s ▁ obtained ▁ by ▁ n - 3 ▁ keystrokes . ▁ ▁ 2 . ▁ pressing ▁ Ctrl - V ▁ twice ▁ after ▁ ▁ copying ▁ the ▁ A ' s obtained by n - 4 keystrokes . 3. pressing Ctrl - V thrice after copying the A 's  obtained by n-5 keystrokes.
screen [ n - 1 ] = Math . max ( 2 * screen [ n - 4 ] , Math . max ( 3 * screen [ n - 5 ] , 4 * screen [ n - 6 ] ) ) ; } return screen [ N - 1 ] ; }