#include<bits/stdc++.h>
using namespace std;
long long n,x,maxn=-0x7f,minn=0x7f;
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		cin>>x;
		minn=min(minn,x);
		maxn=max(maxn,x-minn);
	}
    cout<<maxn;
    return 0;
}

神奇的95分