import java.util.*;
import java.io.*;
public class SocialMedia {
	public static void main(String[] args) throws IOException {
		File dataFile = new File("DATA1.txt");
		File outputFile = new File("OUT1.txt");
		Scanner readFile = new Scanner(new FileReader(dataFile));
		ArrayList fileContents = new ArrayList();
		ArrayList outputs = new ArrayList();
		int numberMinutes;
		double numberMinutesAvailable;
		while (readFile.hasNextLine()) {
			fileContents.add(readFile.nextLine());
		}
		readFile.close();
		numberMinutes = 30*5*60;
		BufferedWriter writeToFile = new BufferedWriter(new FileWriter(outputFile));
		for (int i = 0; i < fileContents.size(); i++) {
			numberMinutesAvailable = ((double)numberMinutes/(double)Integer.decode(fileContents.get(i).toString()));
			numberMinutesAvailable = (int)(numberMinutesAvailable+0.5);
			outputs.add((int)numberMinutesAvailable);
			writeToFile.write(outputs.get(i).toString());
			if (i < fileContents.size()-1) {
				writeToFile.newLine();
			}
		}
		writeToFile.close();
	}
}