escribe un programa que lea cuatro números y determine y determine cual de ellos es el mayor

int main()
{
    int num1, num2, num3, num4;
    cout << "Enter four integers: ";
    cin >> num1 >> num2 >> num3 >> num4;

    // If user enters four equal numbers
    if(num1 == num2 && num2 == num3 && num3 == num4)
        cout << "All numbers are equal";

    // If any of two pairs are equal
    else if(num1 == num2 && num3 == num4)
        cout << "Both pairs are equal";
    else if(num1 == num3 && num2 == num4)
        cout << "Both pairs are equal";
    else if(num1 == num4 && num2 == num3)
        cout << "Both pairs are equal";

    // If none of above conditions is true
    else
        cout << "No pairs are equal";

    return 0;
}