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- Project Euler #225: Tribonacci non-divisors

# Project Euler #225: Tribonacci non-divisors

# Project Euler #225: Tribonacci non-divisors

Contest ends in

_{This problem is a programming version of Problem 225 from projecteuler.net}

The sequence , , , , , , , , , , , , , ... is defined by and .

It can be shown that does not divide any terms of this sequence. In fact, is the first odd number with this property.

Given , and , find the th odd number that does not divide any terms of the above sequence.

**Input Format**

First and only line of each test file contains four integers separated by single spaces: , , and .

**Constraints**

- are odd

**Output Format**

Print exactly one number that is the answer to the problem.

**Sample Input 0**

```
1 1 1 1
```

**Sample Output 0**

```
27
```

**Sample Input 1**

```
1 29 19 131
```

**Sample Output 1**

```
2019
```

**Explanation 1**

Happy New Year!