import "std/io"

fun main() {
    let a = 0;
    let b = 1;
    let i = 0;
    while i < 5 {
        let temp = a;
        a = b;
        b = temp + b;
        i = i + 1;
    }
    print(a);
}

fun fib(n: int64) -> int64 {
    if n <= 1 {
        return n;
    } else {
        return fib(n - 1) + fib(n - 2);
    }
}