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- All Contests
- ProjectEuler+
- Project Euler #178: Step Numbers

# Project Euler #178: Step Numbers

# Project Euler #178: Step Numbers

Contest ends in

_{This problem is a programming version of Problem 178 from projecteuler.net}

Consider the number .

It can be seen that each pair of consecutive digits of has a difference of one.

A number for which every pair of consecutive digits has a difference of one is called a step number.

A pandigital number contains every decimal digit from to at least once.

How many pandigital step numbers less than are there?

**Input Format**

The input contains only one integer .

**Constraints**

**Output Format**

Print the only integer which is the answer to the problem.

**Sample Input 0**

```
10000000000
```

**Sample Output 0**

```
1
```

**Explanation 0**

The only pandigital step-number less than is .