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package main
import (
"bufio"
"fmt"
"os"
"sort"
"strconv"
)
func abs(a int) int {
if a > 0 {
return a
} else {
return -a
}
}
func splitOnCommas(data []byte, atEOF bool) (advance int, token []byte, err error) {
var ch byte
for advance, ch = range data {
if ch < '0' || ch > '9' {
break
}
}
if advance > 0 {
token = data[0:advance]
advance++ // skip the comma
}
return
}
func main() {
positions := make([]int, 0)
s := bufio.NewScanner(os.Stdin)
s.Split(splitOnCommas)
for s.Scan() {
n, _ := strconv.Atoi(s.Text())
positions = append(positions, n)
}
sort.Ints(positions)
medianPosition := len(positions) / 2
median := 0
if len(positions)%2 == 0 {
median = positions[medianPosition]
} else {
median = (positions[medianPosition] + positions[medianPosition+1]) / 2
}
total := 0
for _, i := range positions {
total += abs(i - median)
}
fmt.Println(total)
}
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