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## A. Fibonacci Sequence

Time limit: 1.0 second
Memory limit: 64 MB is an infinite sequence of integers that satisfies to Fibonacci condition Fi + 2 = Fi + 1 + Fi for any integer i. Write a program, which calculates the value of Fn for the given values of Fi and Fj.

### Input

The input contains five integers in the following order: i, Fi, j, Fj, n.
−1000 ≤ i, j, n ≤ 1000, i ≠ j,
−2·109Fk ≤ 2·109 (k = min(i, j, n), …, max(i, j, n)).

### Output

The output consists of a single integer, which is the value of Fn.

### Sample

inputoutput
`3 5 -1 4 5`
`12`

### Notes

In the example you are given: F3 = 5, F−1 = 4; you asked to find the value of F5. The following Fibonacci sequence can be reconstructed using known values:
…, F−1 = 4, F0 = −1, F1 = 3, F2 = 2, F3 = 5, F4 = 7, F5 = 12, …
Thus, the answer is: F5 = 12.
Problem Source: Quarterfinal, Central region of Russia, Rybinsk, October 17-18 2001
To submit the solution for this problem go to the Problem set: 1133. Fibonacci Sequence