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C. Drazil and Factorial

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputDrazil is playing a math game with Varda.

Let's define for positive integer *x* as a product of factorials of its digits. For example, .

First, they choose a decimal number *a* consisting of *n* digits that contains at least one digit larger than 1. This number may possibly start with leading zeroes. Then they should find maximum positive number *x* satisfying following two conditions:

1. *x* doesn't contain neither digit 0 nor digit 1.

2. = .

Help friends find such number.

Input

The first line contains an integer *n* (1 ≤ *n* ≤ 15) — the number of digits in *a*.

The second line contains *n* digits of *a*. There is at least one digit in *a* that is larger than 1. Number *a* may possibly contain leading zeroes.

Output

Output a maximum possible integer satisfying the conditions above. There should be no zeroes and ones in this number decimal representation.

Examples

Input

4

1234

Output

33222

Input

3

555

Output

555

Note

In the first case,

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

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