vector

#include<bits/stdc++.h>
using namespace std;
const int N=100000001;
int n;
int main(){
vector<int>a;
cin>>n;
for(int i=1;i<=n;i++){
int t;
cin>>t;
a.push_back(t);
}
int maxx=-NULL;
vector<int>::iterator k;
for(k=a.begin();k!=a.end();k++){
if(*k>maxx) maxx=*k;
}
cout<<maxx;
return 0;
}