#include<bits/stdc++.h>
using namespace std;
double a;
int main(){
	int n,m,k=0,j;
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>m;
		if(m>k){
			k=m;
		}
	}
	cout<<k;
//	printf("%.1f\n",a); 
}
/**************************************************************
	Problem: 1305
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/