input: def power_mod(n: int, p: int):
      """Compute 2 raised to the power of n modulo p (consider numerical limits).
      >>> power_mod(3, 5)
      3
      >>> power_mod(1101, 101)
      2
      >>> power_mod(0, 101)
      1
      >>> power_mod(3, 11)
      8
      >>> power_mod(100, 101)
      1
      """
output:     return pow(2, n, p)