Sum of the First K Powers of Two
Print 1 + 2 + 4 + … + 2K−1.
Input: one integer K.
Output: 2K − 1.
Constraints:
- 1 ≤ K ≤ 62
Sample Tests
Input 1
3
Output 1
7
Input 2
1
Output 2
1
Discussion (opens after you solve — no spoilers before)
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