input: def power_modulo(n: int, p: int):
      """Calculate 2^n mod p and return the result.
      >>> power_modulo(3, 5)
      3
      >>> power_modulo(1101, 101)
      2
      >>> power_modulo(0, 101)
      1
      >>> power_modulo(3, 11)
      8
      >>> power_modulo(100, 101)
      1
      """
output:     return pow(2, n) % p