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Sum of an AP
     

Write a program to print sum of an AP with n terms with first term a and common difference d.

Input: 

The first line of the input contains T denoting the number of testcases. The first line of the test case will be the number of terms of AP and second line its first term and common difference.
Output:

For each test case, output will be the sum of AP 
Constraints:

1 <= T<= 100

1 <= N <= 1000

1 <= a,d <= 100


Example:

Input:

1
5
1 3

Output: 

35

**For More Examples Use Expected Output**


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Result:
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