#include<bits/stdc++.h>

using namespace std;

#define maxn 200005

#define ll long long

int n,a[maxn];

ll ans;

ll solve(){

    ll Max=-,Min=,sum[maxn];

    sum[]=;

    for(int i=;i<n;i++){

        sum[i]=sum[i-]+a[i];

        Min=min(Min,sum[i]);

        Max=max(Max,sum[i]-Min);

    }

    return Max;

} 

int main(){

    scanf("%d",&n);

    for(int i=;i<=n;i++) scanf("%d",&a[i]);

    for(int i=;i<=n-;i++) a[i]=abs(a[i+]-a[i]);

    for(int i=;i<=n-;i++) if(i%==) a[i]/=-;

    ans=-;

    ans=max(ans,solve());

    for(int i=;i<=n-;i++) a[i]*=-;

    ans=max(ans,solve());

    printf("%lld",ans);

}