Calculating Running Total with a Validation Loop in python

I am new to python and trying to calculate a running total while validating the user input. If the user inputs invalid data I am showing an error and asking the user to input the correct data. My issue is I am unable to determine how to calculate only the valid data input from the user instead of all values.

# This program calculates the sum of a series
# of numbers entered by the user.

#Initialize an accumulator variable.
total = 0

#Request max value from user.
max_value = int(input("Enter a value for the maximum number: "))

#Request user to enter value between 1 and max value.
number = int(input("Enter a number between 1 and " + str(max_value) + " or negative number to end: "))

#Calculate total of user input values.
while number > 0:
      total = total + number
      number = int(input("Enter a number between 1 and " + str(max_value) + " or negative number to end:"))

#Display error if user entered invalid value.
    if number == 0 or number > max_value:
        print("Number entered is invalid!")

#Print sum of valid user input data. 
else:
    print("Sum of all valid numbers you entered:", total)