Why does the following pseudocode not perform as indicated in the comments?

// This program gets a dollar amount from the user // and validates the input. Declare Real amount // Get the amount from the user. Display "Enter a dollar amount" Input amount // Make sure the amount is not less than zero. If it is, // get a new amount from the user. While amount < 0 Display "ERROR: The dollar amount cannot be less than 0." Display "Enter a dollar amount." End While