#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;
}
/**************************************************************
	Problem: 1305
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/