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Given a number '**N**'. The task is to find the N^{th} number whose each digit is a prime number i.e 2, 3, 5, 7. In other words you have to find nth number of this sequence : 2, 3, 5, 7, 22, 23 ,.. and so on.

**Example 1:**

**Input:
**N = 10
**Output: **33**
Explanation:**10^{th} number in the sequence of
numbers whose each digit is prime is 33.

**Example 2:**

**Input:
**N = 21
**Output: **222**
Explanation:**21^{st} number in the sequence of
numbers whose each digit is prime is 222.

**Your Task:**

Complete **primeDigits **function and return the nth number of the given sequence made of prime digits.

**Constraints:**

1 <= N <= 100

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Nth number made of prime digits

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