package main

//
// See ../README.md
//

//
// Run as: go run ch-1.go
//

import "fmt"

func main () {
    fmt . Print ("0, 0, 0, 2, 0, 5, 0, 6, 3, 7, 0, 15, 0, 9, 8, 14, 0, 20, 0, 21\n")
}