import java.util.Scanner;

/*
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* and open the template in the editor.
*/

/**
*
* @author sara
*/
public class ghest {
public static void main(String[] args) {
Scanner sara=new Scanner(System.in);
int mounth;
double vam,karmozd,sood,mablagh,ghest;
System.out.println("cheghadr vam mikhay:");
vam=sara.nextDouble();
System.out.println("dar che modat:");
mounth=sara.nextInt();
System.out.println("che meghdar kamrmozdeshe:");
karmozd=sara.nextDouble();
sood=(vam*karmozd*(1+mounth))/2400;
mablagh=vam+mounth;
ghest=mablagh/mounth;

System.out.println("ghest = "+ghest);




}