MultiplicationSIgn

using System;
//Write a program that shows the sign (+, - or 0) 
//of the product of three real numbers,
//without calculating it. Use a sequence of if operators. Examples:
//a 	b	    c	    result
//5	    2	    2	    +
//-2    -2	    1	    +
//-2	4	    3	    -
//0	    -2.5	4	    0


class MultiplicationSign
{
    static void Main()
    {
        double a = double.Parse(Console.ReadLine());
        double b = double.Parse(Console.ReadLine());
        double c = double.Parse(Console.ReadLine());
        if (((a < 0 && b < 0) && (c > 0) || (a > 0 && b > 0) && (c > 0)))  
        {
            Console.WriteLine("+");
        }
        else if (a == 0)
        {
            Console.WriteLine("0");
        }
        else
        {
            Console.WriteLine("-");
        }
    }
}