def suma_termes_1 (a, b, n):
    suma = a
    x = a
    for i in range(n-1):
        if x%b == 0 or x%10 == b:
            x = 2 * x
        else:
            x = 3 * x + b
        suma = suma + x
    return suma

def suma_termes_2 (a, b, xmax):
    suma = 0
    x = a
    while x < xmax:
        suma = suma + x
        if x%b == 0 or x%10 == b:
            x = 2 * x
        else:
            x = 3 * x + b
    return suma