#include <bits/stdc++.h>
using namespace std;
   
int main(){
    int n,x,y=0;
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>x;
        if(x>y){
            y=x;
        }
    }
    cout<<y<<endl;
}
/**************************************************************
	Problem: 2040
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/