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#include <bits/stdc++.h>
using namespace std;
int n, x, y, res;
/*
8
151 120 144 182 160 158 147 161
*/
int main() {
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> y;
if (x) res = max(res, abs(y - x));
x = y;
}
cout << res << endl;
return 0;
}