Competitions

# Виток 1, Шаг 8 - Битовые операции

# The sum of powers of two

Given two not negative integers **n**, **m** < **30**, **n** and **m** are different.

Find the value of the sum `2`

+ ^{n}`2`

using only bit operations.^{m}

#### Input

Two nonnegative integers **n** and **m**.

#### Output

Print the value of the sum `2`

+ ^{n}`2`

.^{m}

Input example #1

1 2

Output example #1

6