fun square(a) {
    return a * a;
}

fun add(a, b) {
    return a + b;
}

fun mul(a, b) {
    return a * b;
}

// Funtion with multiple args & nested calls to different functions
fun addmul(a, b, c) {
    return mul(add(a, b), c);
}

a <- 10;
b <- 20;
c <- 3;

result <- addmul(a, b, c) + square(c);

// Access and modify outer variable. Argument `a` must not be used from outer var
fun sub_from_result(a) {
    result = result - a;
}

sub_from_result(30);

print result;