/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	static int minimumSwaps(int[] arr) {
        int swaps = 0;
        HashMap<Integer, Integer> hm = new HashMap<>();
        for(int i=0; i<arr.length; i++)
            hm.put(arr[i],i); //unsorted
 
        int [] temp = arr;
        Arrays.sort(temp);
 
        for(int num: hm.keySet()) {
            int index = hm.get(num);
            System.out.println(index + " " + num);
            if(temp[index] != arr[index]) {
                int actual_index = hm.get(temp[index]);
                int t = arr[index];
                arr[index] = arr[actual_index];
                arr[actual_index] = t;
                swaps++;
            }
        }
        return swaps;
    }
 
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		int arr[] = {1, 3, 5, 2, 4, 6, 7};
		System.out.println(minimumSwaps(arr));
	}
}

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