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Given three integers x, y, and z, the task is to find the sum of all the numbers formed by

having 4 at most x times, having 5 at most y times, and having 6 at most z times as a digit.

**Note: **Output the sum modulo 10^{9}+7.

**Example 1:**

Input: X = 1, Y = 1, Z = 1Output:3675Explanation: 4 + 5 + 6 + 45 + 54 + 56 + 65 + 46 + 64 + 456 + 465 + 546 + 564 + 645 + 654 = 3675

**Input: **X = 0, Y = 0, Z = 0
**Output: **0
**Explanation**: No number can be formed

**Your Task: **

You don't need to read input or print anything. Complete the function ** getSum() **which takes

0 ≤

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Number Formation

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