fn main() {
    // println!("Hello, world!");

    // let a = 100;
    // for i in 1..100 {
    //     println!("{}", i)
    // }

    // let n = 40;
    // let result = fibonacci(n);
    // println!("The {}th fibonacci number is: {}", n, result);

    println!("ok");

    std::io::stdin().read_line(&mut String::new()).expect("TODO: panic message");
}

fn fibonacci(n: i32) -> i32 {  
    if n <= 1 {  
        return n;  
    }  
    return fibonacci(n-1) + fibonacci(n-2);  
}