package main

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

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

	minV, maxV := g, g
	if c < minV {
		minV = c
	}
	if l < minV {
		minV = l
	}
	if c > maxV {
		maxV = c
	}
	if l > maxV {
		maxV = l
	}

	if maxV-minV >= 10 {
		fmt.Println("check again")
	} else {
		median := g + c + l - minV - maxV
		fmt.Printf("final %d\n", median)
	}
}