fn main(args: [String]) -> () {
    printi64(fib(parsei64(args[0], 0)));
    println("");
}

// Compute the nth number of the Fibonacci sequence
fn fib(n: i64) -> i64 {
    if (n < 2) {
        n
    } else {
        fib(n-1) + fib(n-2)
    }
}