n=int(input())
list1=[]
for i in range(n):
a=int(input())
list1.append(a)
print(max(list1))

#include<bits/stdc++.h>
using namespace std;
long long a[1000001],i,n;
int main()
{
cin>>n;
for(i=1;i<=n;i++)
cin>>a[i];
sort(a+1,a+n+1);
cout<<a[n];
return 0;
}