Lemonade | Python Fiddle

import math
def cost_function(s,l,a,b):	
    c = ((s * a) + (l * b)) #cost calculation
    print(c)
    return c
def change_function(c, m):
  
    if m < c:
        print("Not enough. Enter correct amount")
        m = int(raw_input())
    else: 
        w = m - c
        dollars = int(w) #number of dollar coins returned
        quarters = math.ceil((w - dollars) // .25) #numberr of quarters returned
        dimes = math.ceil((w - dollars - (quarters * .25)) // .10) #number of dimes returned
        nickels = math.ceil((w - dollars - (quarters * .25) - (dimes * .10)) // .05) #number of nickels returned
        r = ((w - dollars - (quarters * .25) - (dimes * .10) - (nickels * .05)))
        pennies = math.ceil(r / 0.01)
        print(dollars, quarters, dimes, nickels, pennies)
        return
        
print("How many small lemonades?") 
s = int(raw_input()) #user inputs number of small lemonades
print(s)
print("How many large lemonades?") 
l = int(raw_input()) #user inputs number of large lemonades
print(l)
c = cost_function(s, l, .53, 1.15)
print("PAY ME")
m = int(raw_input()) #user inputs dollar amount
print(m)
change_function(c, m)

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