Counting in Sevens

Easy

A tribe on a remote island counts using only seven digits, 0 through 6, and each place is worth 7 times the place to its right. You are given an integer value. Return a string with its base 7 representation. Negative numbers get a leading -, and there must be no leading zeros (zero itself is written as "0").

Example 1

value=60 → '114'

60 = 1·49 + 1·7 + 4, so in base seven it is 114.

Example 2

value=-14 → '-20'

14 = 2·7 + 0, which is 20; the minus sign stays in front.

Example 3

value=6 → '6'

Numbers below 7 take a single digit, same as in decimal.

Constraints

-10⁷ ≤ value ≤ 10⁷

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Topics

Math

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Input

value=60

Expected

'114'

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