package main

import . "fmt"

func NewFib() func() int {
	var f, g int = 0, 1
	return func() int {
		f, g = g, f + g
		return f
	}

}

func main() {	
	f := NewFib()
	Println(f())
	Println(f())
	Println(f())
	Println(f())
	Println(f())
	Println(f())
	Println(f())
	Println(f())
}