func main(num) {
    println("num = ", num)
    println("num*3 = ", num*3)
    println("num+5 = ", num+5)
    println("num/5 = ", num/5)
    println("4*-num = ", 4*-num)
    println("(num-1)*(num+1)*(num+3) = ", (num-1)*(num+1)*(num+3))
}

//TESTCASE: 12
//num = 12
//num*3 = 36
//num+5 = 17
//num/5 = 2
//4*-num = -48
//(num-1)*(num+1)*(num+3) = 2145