#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
int n,i,a[i];
while(cin>>n)
{
for(i=0;i<n;i++)
{
cin>>a[i];
}
i--;
int max=0;
while(i>=0)
{
if(a[i]>max) max=a[i];
i--;
}
cout<<max<<endl;
}
}