Python - ¡Ayuda porfavor! Me sale can't multiply sequence by non-int of type 'str'

print("codigo de colores")

x = str(input("Primer color: "))

y = str(input("Segundo color: "))

z = str(input("Multiplicador(Color): "))

w = str(input("tolerancia(Color): "))

lol = (str(x)[0]+str(y)[0])

total = lol * z

print("Su resistencia es ", total, "con una toleraciona de +/-", w)

def fun(x):

    if x == "negro":

        val = 0

    elif x == "marron":

        val = 1

    elif x == "rojo":

        val = 2

    elif x == "naranja":

        val = 3

    elif x == "amarillo":

        val = 4

        print(val)

    elif x == "verde":

        val = 5

    elif x == "azul":

        val = 6

    elif x == "violeta":

        val = 7

    elif x == "gris":

        val = 8

    elif x == "blanco":

        val = 9

    else:

        print("color incorrecto")

    return val

def fun2(y):

    if y == "negro":

        val = 0

    elif y == "marron":

        val = 1

    elif y == "rojo":

        val = 2

    elif y == "naranja":

        val = 3

    elif y == "amarillo":

        val = 4

    elif y == "verde":

        val = 5

    elif y == "azul":

        val = 6

    elif y == "violeta":

        val = 7

    elif y == "gris":

        val = 8

    elif y == "blanco":

        val = 9

    else:

        print("color incorrecto")

    return val

def fun3(z):

    if z == "negro":

        val = 1

    elif z == "marron":

        val = 10

    elif z == "rojo":

        val = 100

    elif z == "naranja":

        val = 1000

    elif z == "amarillo":

        val = 10000

    elif z == "verde":

        val = 100000

    elif z == "azul":

        val = 1000000

    elif z == "violeta":

        val = 10000000

    elif z == "oro":

        val = 0.1

    elif z == "plata":

        val = 0.01

    else:

        print("color incorrecto")

    return val

def fun4(w):

    if w == "negro":

        res = 1

    elif w == "marron":

        res = 2

    elif w == "verde":

        res = 0.5

    elif w == "azul":

        res = 0.25

    elif w == "violeta":

        res = 0.10

    elif w == "gris":

        res = 0.05

    elif w == "oro":

        res = 5

    elif w == "plata":

        res = 10

    else:

        print("color incorreto")

    return res

#-*- coding: utf - 8 -*-

color={"negro":"0","marron":"1","rojo":"2","naranja":"3","amarillo":"4","verde":"5","azul":"6","violeta":"7","gris":"8","blanco":"9"}

multiplicador={"negro":1,"marron":10,"rojo":100,"naranja":1000,"amarillo":10000,"verde":100000,"azul":1000000,"violeta":10000000,"oro":0.1,"plata":0.01 }

tolerancia={"negro":1,"marron":2,"verde":0.5,"azul":0.25,"violeta":0.10,"gris":0.05,"oro":5,"plata":10}

def resistencia(primer,segundo,multiplica,tolera):

   return f"Su resistencia es de {int(color.get(primer)+color.get(segundo)) * multiplicador.get(multiplica)} ohms con una tolerancia de +/- {tolerancia.get(tolera)}"

print("Código de colores")

print(list(color.keys()))

x = input("Primer color: ")

y = input("Segundo color: ")

print("\nCódigo de colores [multiplicador]")

print(list(multiplicador.keys()))

z = input("Multiplicador(Color): ")

print("\nCódigo de colores [tolerancia]")

print(list(tolerancia.keys()))

w = input("Tolerancia(Color): ")

try:

   print(resistencia(x,y,z,w))

except:

   print("Color inexistente")