백준 4단계 no.4

import java.util.*;

public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        int[] arr1 = new int[10];
        int[] arr2 = new int[42];
        int count = 0;

        for (int i = 0; i < arr1.length; i++) {
            arr1[i] = sc.nextInt();
        }

        for (int j = 0; j < arr1.length; j++) {
            int i = arr1[j]%42;

            arr2[i]++;
        }

        for (int k = 0; k < arr2.length; k++) {
            if (arr2[k] != 0) {
                count++;
            }
        }
        
        System.out.print(count);
    }
}