#include<stdio.h>
void judge(int True,int Fake)
{
if (True == 0)
{
if (Fake == 1)
printf("i\n\n");
else if (Fake == 0)
printf("0\n\n");
else if (Fake == -1)
printf("-i\n\n");
else
printf("%di\n\n", Fake);
}
else if (Fake == 1)
printf("%d+i\n\n", True);
else if (Fake == 0)
printf("%d\n\n", True);
else if (Fake == -1)
printf("%d-i\n\n", True);
else if (Fake > 0)
printf("%d+%di\n\n", True, Fake);
else if (Fake < 0)
printf("%d%di\n\n", True, Fake);
}
int main()
{
float true1;
float true2;
float fake1;
float fake2;
int logo;
int True = 0, Fake = 0;
while (~scanf("%f%f%f%f%d",&true1,&fake1,&true2,&fake2,&logo))
{
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);
}
}