using System;

class CorrectBrackets
{
    static void Main()
    {
        //•	Write a program to check if in a given expression the brackets are put correctly.

        //string test = "(a + b) + (a * b)";
        //string test = ")(78 * 25)";
        //string test = "(a / b) + (";
        //string test = "(a + b))";
        //string test = "(( c - m)";
        string test = "((a + b) - (c * d))";

        int indexOpen = test.IndexOf("(");
        int indexClosed = test.IndexOf(")");


        for (int i = 0; i < test.Length; i++)
		{
            indexOpen = test.IndexOf("(", indexOpen + 1);
            indexClosed = test.IndexOf(")", indexClosed + 1);

            if (indexOpen > indexClosed)
            {
                Console.WriteLine("Incorrect expression");
                break;
            }
            else if (i == test.Length - 1)
            {
                Console.WriteLine("Correct expression");
            }
	    }

    }
}