im trying to complete a first year python buisness course assignment and my while loop just wont exit, can anyone help?

salespersons = 0

while int(salespersons) != -1:

sales = float(input("Please enter the salesperson's monthly sales: "))
advance_pay = float(input("Please enter the salesperson's advance pay: "))

data = commision_table(sales,commisionTable)

commision = sales * data[1]
pay =  commision - data[0] - advance_pay
print("The Monthly pay is :", pay)

salespersons = int(input("Are there more salespersons, press any number - If not press -1? "))
salespersons = -1

i tried using booleans and operators but it keeps resetting salespersons to 0, im not sure why. i even tried using break and quit() and the loop just refused to stop working – it kept looping. i also tried casting all the variables including salespersons into int, but it still wont work.