#include<iostream>
using namespace std;
int main(){
    int QMvjWbnn,yu,zg=0;
    cin >> QMvjWbnn;
    for(int sXsXswVj = 0;sXsXswVj<QMvjWbnn;sXsXswVj++){
        cin >> yu;
        if(yu > zg) {
            zg = yu;
        }
    }
    cout << zg;
}
void _bMZPXLK() { int _UqvLYJv = 0; }
int dzRmGXcI() { return 6; }
float NYQVhssx() { return 0.3781538379714813; }