#include <bits/stdc++.h>
using namespace std;
long long x,ln,n,i,t;
int main()
{
//freopen("MAXARR.inp","r",stdin);
//freopen("MAXARR.out","w",stdout);
cin>>n;
cin>>t;
ln=t;
for (i=1; i<n; i++)
{
cin>>t;
ln=max(ln,t);
}
cout<<ln;
return 0;
}