import java.util.Scanner;
import com.sun.jndi.url.iiopname.iiopnameURLContextFactory;
public class a123 {
public static void judge(int True,int Fake){
if (True == 0) {
if (Fake == 1)
System.out.printf("i\n\n");
else if (Fake == 0)
System.out.printf("0\n\n");
else if (Fake == -1)
System.out.println("-i\n\n");
else
System.out.printf("%di\n\n", Fake);
} else if (Fake == 1)
System.out.printf("%d+i\n\n", True);
else if (Fake == 0)
System.out.printf("%d\n\n", True);
else if (Fake == -1)
System.out.printf("%d-i\n\n", True);
else if (Fake > 0)
System.out.printf("%d+%di\n\n", True, Fake);
else if (Fake < 0)
System.out.printf("%d%di\n\n", True, Fake);
}
public static void main(String args[]) {
float true1;
float true2;
float fake1;
float fake2;
int logo;
int True = 0, Fake = 0;
Scanner in = new Scanner(System.in);
while (in.hasNext()) {
true1 = in.nextFloat();
fake1 = in.nextFloat();
true2 = in.nextFloat();
fake2 = in.nextFloat();
logo = in.nextInt();
if (logo == 0) {
True = (int) (true1 + true2);
Fake = (int) (fake1 + fake2);
} else if (logo == 1) {
True = (int) (true1 - true2);
Fake = (int) (fake1 - fake2);
} else if (logo == 2) {
True = (int) (true1 * true2 - fake1 * fake2);
Fake = (int) (true1 * fake2 + fake1 * true2);
} else if (logo == 3) {
True = (int) ((true1 * true2 + fake1 * fake2) / (true2 * true2 + fake2 * fake2));
Fake = (int) ((fake1 * true2 - true1 * fake2) / (true2 * true2 + fake2 * fake2));
}
judge(True, Fake);
}
}
}