1 #include<iostream>
 2 #include<cstdio>
 3 
 4 using namespace std;
 5 
 6 int n,m = 999999999,a,ans = -999999;
 7 
 8 inline int max(int s,int d) {
 9     if(s >= d) return s;
10     else return d;
11 }
12 
13 int main() {
14     scanf("%d",&n);
15     for(int i = 1;i <= n; i++) {
16         scanf("%d",&a);
17         if(a < m) m = a;
18         else ans = max(ans,a - m);
19     }
20     printf("%d",ans);
21     return 0;
22 }