/* 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 ArrayNesting
{
	public int findSetS(int[] nums) {
    boolean[] visited = new boolean[nums.length];
    int res = 0;
    for (int i = 0; i < nums.length; i++) {
      if (!visited[i]) {
        int start = nums[i], count = 0;
        do {
          start = nums[start];
          count++;
          visited[start] = true;
        }
        while (start != nums[i]);
        res = Math.max(res, count);
      }
    }
    return res;
  }
 
  public static void main(String[] args) {
 
    ArrayNesting arrayNesting = new ArrayNesting();
 
    int[] arr = new int[]{5, 4, 0, 3, 1, 6, 2};
    System.out.println(arrayNesting.findSetS(arr));
  }
}

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