import java.util.Scanner;

public class No926 {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    double daysOfYear = sc.nextDouble();
    double daysOfWeek = sc.nextDouble();
    double holidaysOfWeek = sc.nextDouble();
    sc.close();

    System.out.println(daysOfYear / daysOfWeek * holidaysOfWeek);
    
  }
  
}