Find the largest integer that can be formed with exactly N matchsticks, under the following conditions:
- Every digit in the integer must be one of the digits $A_1, A_2, ..., A_M (1 \leq A_i \leq 9)$.
- The number of matchsticks used to form digits 1, 2, 3, 4, 5, 6, 7, 8, 9 should be 2, 5, 5, 4, 5, 6, 3, 7, 6, respectively.

-----Constraints-----
- All values in input are integers.
- $2 \leq N \leq 10^4$
- $1 \leq M \leq 9$
- $1 \leq A_i \leq 9$
- A_i are all different.
- There exists an integer that can be formed by exactly N matchsticks under the conditions.

-----Input-----
Input is given from Standard Input in the following format:
N M
A_1 A_2 ... A_M

-----Output-----
Print the largest integer that can be formed with exactly N matchsticks under the conditions in the problem statement.

-----Sample Input-----
20 4
3 7 8 4

-----Sample Output-----
777773

The integer 777773 can be formed with 3 + 3 + 3 + 3 + 3 + 5 = 20 matchsticks, and this is the largest integer that can be formed by 20 matchsticks under the conditions.

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