package main
import (n"net"
t"strings"
r"strconv"
x"regexp"
"os")
func main(){l,_:=n.Listen("tcp",":"+os.Args[1])
for{c,_:=l.Accept()
var s int=0
for _,i:=range t.Split(x.MustCompile(":[0-9]+$").ReplaceAllLiteralString(c.RemoteAddr().String(),""),"."){
n,_:=r.Atoi(i)
s=s+n}
c.Write([]byte(r.Itoa(s)))
c.Close()}}