package main

import (
	"bufio"
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"strings"
	"time"

	"github.com/influxdata/cron"
)

func init() {
	verbose := flag.Bool("v", false, "display log output")
	flag.Parse()

	if *verbose {
	} else {
		log.SetOutput(ioutil.Discard)
		log.SetFlags(0)
	}
}

func main() {
	// seed with a large number that rtcwake can still handle
	m := 268435455
	d := make(chan struct{})
	s := bufio.NewScanner(os.Stdin)

	go func() {
		n := time.Now()
		for s.Scan() {
			//we need to only get the first 5 fields otherwise
			//the cron library will try to parse the rest too
			fields := strings.Split(strings.TrimSpace(s.Text()), " ")
			l := strings.Join(fields[:5], " ")
			p, e := cron.ParseUTC(l)
			if e == nil {
				t, e := p.Next(n)
				if e != nil {
					log.Fatal(e)
				}
				i := int(t.Sub(n).Seconds())
				if i < m {
					m = i
				}
				log.Print(i)
			} else {
				log.Print(e)
			}
		}
		d <- struct{}{}
	}()

	<-d

	fmt.Println(m)

}