Ответ:

a)

n = int(input())

s = 0

for i in range(1, n+1):

s += 2 ** i

print(s)

б)

a = int(input())

x = int(input())

n = int(input())

p = 1

for i in range(1, n+1):

p *= (a ** i + i * x)

print(p)