#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */  
    int n;
    cin>>n;
    int i,*a;
    a=new int [n];
    for(i=0;i<n;i++){
        cin>>a[i];
    }
    int max=0;
    for(i=0;i<n;i++){
        if(a[i]>max){
            max=a[i];    
        } 
    }
    cout<<max;
    return 0;
}