package main

import (
	"fmt"
	"bufio"
	"os"
	"strconv"
	"strings"
)

func main() {
	N := nextInt()
	z := nextIntArray()
	fmt.Print(z[N - 1])
	fmt.Print("/")
	fmt.Print(z[0])

}

func nextIntArray() []int {
	s.Split(bufio.ScanLines)
	s.Scan()
	S := s.Text()
	vs := strings.Split(S, " ")
	N := len(vs)
	data := make([]int, N)
	for i := 0; i < N; i++ {
		v, e := strconv.Atoi(vs[i])
		if e != nil {
			panic(e)
		}
		data[i] = v
	}
	return data
}

var s = bufio.NewScanner(os.Stdin)

func next() string {
	s.Split(bufio.ScanWords)
	s.Scan()
	return s.Text()
}
func nextLine() string {
	s.Split(bufio.ScanLines)
	s.Scan()
	return s.Text()
}

func nextInt() int {
	i, e := strconv.Atoi(next())
	if e != nil {
		panic(e)
	}
	return i
}
func nextLong() int64 {
	i, e := strconv.ParseInt(next(), 10, 64)
	if e != nil {
		panic(e)
	}
	return i
}