the output seems correct
package com.codegym.task.task08.task0812;
import java.io.*;
import java.util.*;
/*
Longest sequence
*/
public class Solution {
public static void main(String[] args) throws IOException {
//write your code here
Scanner scan = new Scanner(System.in);
ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 0; scan.hasNext(); i++) {
list.add(scan.nextInt());
}
Collections.sort(list);
int count = 0;
for (int i = 0; i < list.size()-1; i++) {
if (list.get(i + 1) == list.get(i)) {
count++;
}
}
if (count == 0) {
count = 1;
}
System.out.println(count);
}
}