1051

// 部分正确？？？
//

#include "stdafx.h"
#include<iostream>
#include<iomanip>
#include<cmath>     //sin and cos!




using namespace std;

int main()
{

    double r1, p1, r2, p2;
    cin >> r1 >> p1 >> r2 >> p2;

    double r = r1*r2;
    double p = p1 + p2;

    double a = r*cos(p);
    double b = r*sin(p);


    cout.setf(ios::fixed);
    if (b < 0)
        cout<<setprecision(2) << a << "-" << (-b) << "i";
    else
        cout <<setprecision(2)<< a << "+" << b << "i";

    system("pause");
    return 0;
}