c,d,e

#include<iostream>
#include<cmath>
using namespace std;
struct complex
{
    double re;
    double im;
}z,x;
void citire(struct complex&z)
{
    cin>>z.re>>z.im;
}
int sumar(struct complex x,struct complex z)
{
    double s=0;
    s=s+(x.re+z.re);
    return s;
}
int sumai(struct complex z,struct complex x)
{
    double s1=0;
    s1=s1+(x.im+z.im);
    return s1;
}
int difr(struct complex x,struct complex z)
{
    double d=0;
    d=d+(x.re-z.re);
    return d;
}
int difi(struct complex z,struct complex x)
{
    double d1=0;
    d1=d1+(x.im-z.im);
    return d1;
}
int produsr(struct complex z,struct complex x)
{
    double p=0;
    p=p+(x.re*z.re);
    return p;
}
int produsi(struct complex z,struct complex x)
{
    double p1=0;
    p1=p1+(x.im*z.im);
    return p1;
}
int main()
{
    citire(x);
    citire (z);
    if(sumai(x,z)>0)
    {
        cout<<sumar(x,z)<<"+"<<sumai(x,z)<<"*i"<<endl;
    }
    if(sumai(x,z)<0)
    {
        cout<<sumar(x,z)<<sumai(x,z)<<"*i"<<endl;
    }
    if(difi(x,z)>0)
    {
        cout<<difr(x,z)<<"+"<<difi(x,z)<<"*i"<<endl;
    }
    if(difi(x,z)<0)
    {
        cout<<difr(x,z)<<difi(x,z)<<"*i"<<endl;
    }
    if(produsi(x,z)!=0)
    {
        cout<<produsr(x,z)<<"+"<<produsi(x,z)<<"*i"<<endl;
    }
}
int maxre(struct complex z,struct complex x)
{
    double m1r,m2r;
    m1r=m1r+sqrt(z.re*z.re);
    m2r=m2r+sqrt(x.re*x.re);
    if(m1r>m2r)
    {
        return z.re;
    }
    else
    {
        return x.re;
    }
}
int maxim(struct complex z,struct complex x)
{
    double m1i,m2i;
    m1i=m1i+sqrt(z.im*z.im);
    m2i=m2i+sqrt(x.im*x.im);
    if(m1i>m2i)
    {
        return ;
    }
    else
    {
        return m2i;
    }
}