package main

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

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	n := getNextInt(scanner)
	yy := make([]int, n)
	for i := 0; i < n; i++ {
		yy[i] = getNextInt(scanner)
	}
	mx := 10000
	dp := makeGrid(n+1, mx+1)
	for i := 0; i < n+1; i++ {
		for j := 0; j < mx+1; j++ {
			dp[i][j] = math.MaxInt32
		}
	}
	dp[0][0] = 0
	for i := 0; i < n; i++ {
		mn := dp[i][0]
		for j := 0; j < mx+1; j++ {
			mn.minAs(dp[i][j])
			dp[i+1][j].minAs(mn + cint(abs(yy[i]-j)))
		}
	}
	var ans cint
	ans = math.MaxInt32
	for i := 0; i < mx+1; i++ {
		ans.minAs(dp[n][i])
	}
	fmt.Fprintln(writer, ans)
}
func abs(a int) int {
	if a < 0 {
		return -a
	}
	return a
}
func makeGrid(h, w int) [][]cint {
	index := make([][]cint, h, h)
	data := make([]cint, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

type cint int64

func (ct *cint) minAs(x cint) *cint {
	*ct = ct.min(x)
	return ct
}
func (ct *cint) maxAs(x cint) *cint {
	*ct = ct.max(x)
	return ct
}
func (ct cint) min(x cint) cint {
	if ct > x {
		return x
	}
	return ct
}
func (ct cint) max(x cint) cint {
	if ct < x {
		return x
	}
	return ct
}