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Given 3 numbers A, B and C. Find the greatest number among them.

**Example 1:**

**Input:** A = 10, B = 3, C = 2
**Output:** 10
**Explanation:**
10 is the greatest among the three.

**Example 2:**

**Input:** A = -4, B = -3, C = -2
**Output:** -2
**Explanation:**
-2 is the greatest among the three.

**Your Task:**

You don't need to read input or print anything.Your task is to complete the function **greatestOfThree()** which takes three numbers A,B and C as input parameters and returns the greatest among them.

**Expected Time Complexity:**O(1)

**Expected Auxillary Space:**O(1)

**Constraints:**

-10^{9}<=A,B,C<=10^{9}

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Greatest of three numbers

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