#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define db double
const int N=1e5;
int main () {
    ll n; cin>>n;
    ll a[n],x;
    vector <ll> b;
 
    for(int i=0;i<n;i++) cin>>a[i];
    for (int i=0;i<n-1;i++){
        x=abs(a[i]-a[i+1]);
        b.push_back(x);
    }
    int k=0;
    for (int i=0;i<n;i++) {
        // cout<<b[i]<<" ";
        if (b[i]>k) k=b[i];
        // if (k<a[i]) k=a[i];
    }
 
    cout<<k;
    return 0;
}

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