package main

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

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

	var ans, cur int64
	for i := 0; i < n; i++ {
		var b int64
		fmt.Fscan(in, &b)
		diff := b - cur
		if diff < 0 {
			ans -= diff
		} else {
			ans += diff
		}
		cur = b
	}
	fmt.Println(ans)
}