package main

import (
	"fmt"
	"io"
	"os"
)

func main() {
	data, _ := io.ReadAll(os.Stdin)
	idx := 0

	nextInt64 := func() int64 {
		for idx < len(data) && (data[idx] == ' ' || data[idx] == '\n' || data[idx] == '\r' || data[idx] == '\t') {
			idx++
		}
		sign := int64(1)
		if idx < len(data) && data[idx] == '-' {
			sign = -1
			idx++
		}
		var val int64
		for idx < len(data) && data[idx] >= '0' && data[idx] <= '9' {
			val = val*10 + int64(data[idx]-'0')
			idx++
		}
		return sign * val
	}

	n := int(nextInt64())
	m := nextInt64()
	k := nextInt64()

	var max1, max2 int64
	countMax := 0

	for i := 0; i < n; i++ {
		x := nextInt64()
		if x > max1 {
			max2 = max1
			max1 = x
			countMax = 1
		} else if x == max1 {
			countMax++
		} else if x > max2 {
			max2 = x
		}
	}

	var ans int64
	if countMax >= 2 {
		ans = max1 * m
	} else {
		cntMax := (m/(k+1))*k + m%(k+1)
		ans = cntMax*max1 + (m-cntMax)*max2
	}

	fmt.Print(ans)
}