#include"bits/stdc++.h"
using namespace std;
int main()
{
int x,z,n =0;
cin>>x;
int arr[x];
for(int k=0;k<x;k++)
cin>>arr[k];
for(int i=0;i<x-1;i++)
{
z=arr[i]-arr[i+1];
if(z<0)
z=z*-1;
if(n<z)
n=z;
}
cout<<n;
}
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