#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  long long a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  long long now = 0, ans = 0;
  for (int i = 0; i < n; i++) ans += abs(a[i] - now), now = a[i];
  cout << ans;
}
