source_code: import java.io.*;
  import java.util.*;
  public class a {
  public static void main(String[] args) throws IOException {
  	input.init(System.in);
  	PrintWriter out = new PrintWriter(System.out);
  	long n = input.nextLong();
  	if(n == 1) out.println(5);
  	else out.println(25);
  	out.close();
  }
  
  public static class input {
  	static BufferedReader reader;
  	static StringTokenizer tokenizer;
  
  	static void init(InputStream input) {
  		reader = new BufferedReader(new InputStreamReader(input));
  		tokenizer = new StringTokenizer("");
  	}
  
  	static String next() throws IOException {
  		while (!tokenizer.hasMoreTokens())
  			tokenizer = new StringTokenizer(reader.readLine());
  		return tokenizer.nextToken();
  	}
  
  	static int nextInt() throws IOException {
  		return Integer.parseInt(next());
  	}
  
  	static double nextDouble() throws IOException {
  		return Double.parseDouble(next());
  	}
  
  	static long nextLong() throws IOException {
  		return Long.parseLong(next());
  	}
  }
  }
  
  