백준 5단계(3052)

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
public class Main {
    
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
        //reads all the input strings and converts into int 
        int r = 0;
        String str = null;
        int[] numArr = new int[10];
        while((str = br.readLine()) != null) {
            numArr[r] = Integer.parseInt(str);
            r++;
            if(r == 10) break;
        }
        
        //if checkarr index is remainder of 42 equal to 0, add 1 itself and increase r 
        r = 0;
        int[] checkArr = new int[1000];
        for(int i = 0; i < numArr.length; i++) {
            if(checkArr[numArr[i] % 42] == 0) {
                checkArr[numArr[i] % 42]++;
                r++;
            }
        }
        
        bw.write(String.valueOf(r));
        bw.flush();
        
        
    }
}