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# Problem

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

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

# Output

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

# Explanation for Sample Output

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.

# Editorial

Read only if you are stuck or have already solved the problem.