import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);

    //入力
    double year = Double.parseDouble(sc.next());
    double week = Double.parseDouble(sc.next());
    double holiday = Double.parseDouble(sc.next());

    //処理
    double ave = year / week * holiday;

    //出力
    System.out.println(ave);
  }
}