operator `<`(a, b: int): bool {
    #pragma[magic: "LessThanInt64", pure]
}


operator `-`(a, b: float): float {
    #pragma[magic: "SubFloat64", pure]
}


operator `-`(a, b: int): int {
    #pragma[magic: "SubInt64", pure]
}


operator `+`(a, b: int): int {
    #pragma[magic: "AddInt64", pure]
}


operator `/`(a, b: int): int {
    #pragma[magic: "DivInt64", pure]
}


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


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


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


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


var x = clock();
print(fib(25));
print(clock() - x);