[백준] 1475번 방 번호

import java.util.HashMap;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner kb = new Scanner(System.in);
		
		String number = kb.next();

		HashMap<Character, Integer> map = new HashMap<>();
		
		for(int i=0; i<number.length(); i++) {
			char digit = number.charAt(i);
			map.put(digit, map.getOrDefault(digit, 0)+1);
		}
		
		
        int count6 = map.getOrDefault('6', 0);
        int count9 = map.getOrDefault('9', 0);
		
		map.put('6', (count6 + count9 + 1)/2);
		map.remove('9');
		
		
		int max = 0;
		
		for(int count: map.values()) {
			max = Math.max(max, count);
		}
		
		System.out.println(max);
		
	}
}