Problem

Roma considers a number lucky if every digit of the number is either 4 or 7.

You are given a list of integers. Count how many of them are lucky.

For each number, inspect its decimal digits and decide whether all digits are lucky digits.

Input Format

• The first line contains an integer n — the number of integers.
• The second line contains n space-separated integers.

Output Format

• Print a single integer: the count of lucky numbers in the list.

Constraints

• 1 <= n <= 1000
• Each number is a positive integer that fits in 32-bit signed integer range.

Hints

• Check digits one by one using division and remainder.
• A number is lucky only if every digit is either 4 or 7.