#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;
	return 0;
}

/**************************************************************
	Problem: 2040
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/