source_code: import java.util.*;
  public class Contests {
  
  	public static void main(String[] args) {
  		Scanner clavier=new Scanner(System.in);
  		long a=clavier.nextLong();
  		clavier.close();
  		if(a==1)
  			System.out.println(5);
  		else
  			System.out.println(25);
  	}
  
  }
  