#include <bits/stdc++.h>
using namespace std;
const int maxN = 2e5 + 9, MOD = 1e9 + 7;
int n;
long long arr[maxN], ot[maxN];
long long maxsub(long long *arr, int n) {
  long long cr = LLONG_MIN / 4, maxi = LLONG_MIN / 4;
  for (int i = 0; i < n; i++) {
    cr = max(arr[i], cr + arr[i]);
    maxi = max(maxi, cr);
  }
  return maxi;
}
long long trr(long long *arr, int sta) {
  int ct = 0;
  for (int i = sta, cnd = 1; i + 1 < n; i++, cnd *= -1) {
    ot[ct++] = abs(arr[i] - arr[i + 1]) * cnd;
  }
  return maxsub(ot, ct);
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0), cout.tie(0);
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> arr[i];
  }
  cout << max(trr(arr, 0), trr(arr, 1)) << '\n';
}
