Salary calculator program

#include <iostream>
Using namespace std;

int main ();
{ 
cout << "What is the mean amount you work/week?" << endl;

if (input <= 40)
cout << "Your salary is $8.00/hour";
cin >> a1;
if (a1 <= 0)
cout << "";
cin >> a2;
if (a2 >= 40)
cout << a3
cin >> a3;

cout << "" << endl;
else
cout << " Better luck next time.- the correct answer is " << add << endl;

return 0;

I'm trying to write a C++ program to compute and display a person’s salary as determined by the following expressions:

If hours worked <= 40, the person receives $8/hour otherwise, Person receives the first 40hrs @ $8/hr remaining hrs at 1.5x basic rate.
Program should request: 1) hours worked (input) 2) display the salary earned (output).
Use a constant variable for basic rate so the program can be updated easily when hourly rates change.
Give appropriately input/output. Test program several x with hrs below, =, and above 40.

Any direction will be greatly appreciated!

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As per your code. This is what it should be

#include <iostream>

int main () {
    int hours = 0;
    int rate = 8;

    std::cout << "Enter number of working hours?";
    std::cin >> hours;

    int pay = hours * rate;

    if (40 < hours) {
        pay += (hours - 40) * (rate / 2);
    }

    std::cout << "Total Pay" << pay << std::endl;
    return 0;
}