include[HTML_REMOVED]
using namespace std;
int a[1009];
int n;
int main()
{
while(scanf(“%d”,&n)!=-1)
{
for(int i=1; i<=n; i)
{
cin>>a[i];
}
int res=0;
for(int i=1; i<=n; )
{
int j=i+1;
while(j<=n&&a[j]>=a[j-1])
{
j;
}
res=max(res,a[j-1]-a[i]);
i=j;
}
cout<<res<<endl;
}
}