Binary to Decimal
Given a binary string, print its decimal value.
Input: one line with a binary string S (no leading zeros except the string 0 itself).
Output: the decimal value of S.
Constraints:
- 1 ≤ |S| ≤ 60
Sample Tests
Input 1
1101
Output 1
13
Input 2
0
Output 2
0
Discussion (opens after you solve — no spoilers before)
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