operator `<`(a, b: int): bool {
    #pragma[magic: "LessThan", pure]
}


operator `+`(a, b: int): int {
    #pragma[magic: "Add", pure]
}


operator `-`(a, b: int): int {
    #pragma[magic: "Subtract", pure]
}


operator `-`(a, b: float): float {
    #pragma[magic: "SubtractFloat64", pure]
}

fn clock: float {
    #pragma[magic: "SysClock64"]
}


fn print(x: int) {
    #pragma[magic: "PrintInt64"]
}


fn print(x: float) {
    #pragma[magic: "PrintFloat64"]
}


fn print(x: string) {
    #pragma[magic: "PrintString"]
}


fn fib(n: int): int {
    if n < 2 {
        return n;
    }
    return fib(n - 2) + fib(n - 1);
}


print("Computing the value of fib(30)");
var x = clock();
print(fib(30));
print(clock() - x);
print("Done!");