package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	var g, c, ell int
	fmt.Fscan(in, &g, &c, &ell)

	minv, maxv := g, g
	if c < minv {
		minv = c
	}
	if ell < minv {
		minv = ell
	}
	if c > maxv {
		maxv = c
	}
	if ell > maxv {
		maxv = ell
	}

	if maxv-minv >= 10 {
		fmt.Print("check again")
	} else {
		median := g + c + ell - minv - maxv
		fmt.Printf("final %d", median)
	}
}