How do I go from here?

[scenic rose]

import java.util.*;
  import java.io.*;
  
  public class Main {
    public static void main(String[] args) throws Exception {
      Scanner f=new Scanner(System.in);
      int N=f.nextInt();
      int M=f.nextInt();
      int K=f.nextInt();
      int []ar=new int[N];
      int []hierarchy=new int[M];
      for(int i=0; i<M; i++){
        hierarchy[i]=f.nextInt();
      }
      for(int i=0; i<K; i++){
        int num=f.nextInt();
        int pos=f.nextInt()-1;
        ar[pos]=num;
      }

    }
  }

So i've essentailly established the numbers that have fixed positions in the array and need to find the earliest position 1 can be put whil also keeping in mind that 4 5 6 need to be in order(numbers can be between them). How would I do this?

[clever hamlet]

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