import java.util.Scanner;

public class A2Q2 {
  public static void main (String[] args) {

    //delcare new variables
    Scanner kbd = new Scanner(System.in);
    int days;
    //these amounts change
    int susceptible;
    int exposed;
    int infectious;
    int recovered;
    //constants inputted by user
    double contact;
    double latency;
    double recovery;

    exposed = 0;
    recovered = 0;

    //get input from the user to calculate the amount of people susceptible, exposed, infectious and recovered.
    System.out.print ("How many days long will your simulation be?");
                      days = kbd.nextInt();
    System.out.print ("Input the number of susceptible people:");
                      susceptible = kbd.nextInt();
    System.out.print ("Input the number of infected people:");
                      infectious = kbd.nextInt();
    System.out.print ("Input the contact rate:");
                      contact = kbd.nextDouble();
    System.out.print ("Input the latency rate:");
                      latency = kbd.nextDouble();
    System.out.print ("Input the recovery rate:");
                      recovery = kbd.nextDouble();

    //declare new variables for calculating the amount of susceptible, exposed, infectious and recovered.
    double susceptibleChange;
    double exposedChange;
    double infectiousChange;
    double recoveredChange;

    //calculates changes
      susceptibleChange = ((-contact) * infectious * susceptible);
      exposedChange = (contact * infectious * susceptible) - (latency * exposed);
      infectiousChange = (latency * exposed) - (recovery * infectious);
      recoveredChange = (recovery * infectious);

    //delcare new loop variable
      int i;

    //start for loop
    for (i = 1; i <= days; i++) {

    /*these variables are printed in the final output and calculated by adding the change variable to the
     * initial variable */
    double susceptibleUpdate;
    double exposedUpdate;
    double infectiousUpdate;
    double recoveredUpdate;

      //updates the values to be outputted
      susceptibleUpdate = (susceptible) + (susceptibleChange);
      exposedUpdate = (exposed) + (exposedChange);
      infectiousUpdate = (infectious) + (infectiousChange);
      recoveredUpdate = (recovered) + (recoveredChange);

      //final output
        System.out.println ("Day " + i + ":\n"
                              + "   Number Susceptible: " + Math.round(susceptibleUpdate) +
                              "\n   Number Exposed: " + Math.round(exposedUpdate) +
                              "\n   Number Infectious: " + Math.round(infectiousUpdate) +
                              "\n   Number Recovering: " + Math.round(recoveredUpdate));
        }//close for loop

  }
}