aaaicu

문제 : https://www.acmicpc.net/problem/1475 

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        int[] number = new int[10];
        Scanner scan = new Scanner(System.in);
        String input = scan.nextLine();
        
        int max =0 ;
        
        for (int i = 0; i < input.length(); i++) {
            number[input.charAt(i)-'0']++;
        }
        number[6] = (int)Math.ceil((number[6]+(double)number[9])/2);
        number[9] = 0;
        
        for(int num : number) {
            if(num > max) {
                max = num;
            }
        }        
        System.out.println(max);
        scan.close();
    }
}