## JDCC '15 Contest 2 P1 - Lifting Weights

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Points: 3
Time limit: 2.0s
Memory limit: 64M

Author:
Problem type

Lily has decided that she needs to exercise and has started to lift weights. During her first week of exercising, she was capable of lifting some weight $$A$$. However, as she grew stronger, she was able to lift $$B$$ more kilograms than she could the week before.

Figure out how much weight Lily was able to lift after $$N$$ weeks.

#### Input Specification

The first line of input provides the number of test cases, $$T\ (1 \le T \le 100)$$. $$T$$ test cases follow. Each test case consists of one line containing three integers $$A, B, N\ (1 \le A, B, N \le 100)$$.

#### Output Specification

For each test case, your program should output one integer, how much she should be able to lift.

#### Sample Input

2
2 2 1
2 3 4

#### Sample Output

2
11

#### Explanation for Sample

In the second test case, she was able to lift $$2$$ kilograms in her first week, $$5$$ in her second, $$8$$ in her third, and $$11$$ in her fourth.