import java.util.*;

public class elevador {
    public static void main( String[] args ){
        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        int ans = 0; 
        for( int i = 0, cur = 0, prev = 0; i < n; i++, prev = cur ){
            cur = s.nextInt(); 
            if(i > 0) ans += Math.abs(cur - prev);
        }   
        s.close();
        System.out.println(ans);
    }
}