import java.util.HashMap;
 
 class ideon {
    public static void main(String[] args) {
        int[] arr = {1, 2, 2, 3, 3, 3, 4, 4, 4, 4};
 
        HashMap<Integer, Integer> frequencyMap = new HashMap<>();
 
        // Count frequencies
        for (int num : arr) {
            frequencyMap.put(num, frequencyMap.getOrDefault(num, 0) + 1);
        }
 
        // Print frequencies
        for (int key : frequencyMap.keySet()) {
            System.out.println("Element " + key + " occurs " + frequencyMap.get(key) + " times.");
        }
    }
}
 
 

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