#include<iostream>
#include<cstdlib>
#include<algorithm>
using namespace std;
int main(){
    int n;
    cin>>n;
    int classroom[n];
    int max_classroom=0;
    for(int i=0;i<n;i++){
        cin>>classroom[i];
    }
    for(int i=0;i<n;i++){
        max_classroom=std::max(max_classroom,classroom[i]);
    }
    cout<<max_classroom<<endl;
}