Power | Exact Science

Power

Problem Statement

Write a program that calculates 2^N.

The use of the exponentiation operator is forbidden.

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Input

A single non-negative integer N (0 ≤ N ≤ 30).

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Output

Print the value of 2^N.

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Example

input	output
4	16

Factorial (for loop)

Binomial Coefficient

Geometric Progression

For Loop Sum – 1

For Loop Sum – 2