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Given a number **N**. You can perform an operation on it multiple times, in which you can change digit 5 to 6 and vice versa.

You have to return the sum of the maximum number and the minimum number which can be obtained by performing such operations.

**Example 1:**

**Input:** N = 35
**Output:** 71
**Explanation:** The maximum number which can be
formed is 36 and the minimum number which can
be formed is 35 itself.

**Example 2:**

**Input:** N = 22
**Output:** 44
**Explanation: **The maximum number and minimum
number which can be formed is 22 itself.

**Your Task:**

You need not take any input or print anything. Your task is to complete the function ** performOperation() **which takes a single Number as input and returns the sum of maximum and minimum number.

**Expected Time Complexity:** O(Log_{10}N)

**Expected Auxiliary Space:** O(Log_{10}N)

**Constraints:**

1 ≤ N ≤ 10^{18}

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