#include <iostream>
#include <algorithm>
#include <iomanip>
#include <cmath>
using namespace std;
 
int main() {
    int m;
    cin >> m;
    long long int max = 0;
    for (int i = 0; i < m; i++) {
        int x;
        cin >> x;
        if (max < x)max = x;
    }
 
        cout << max;
    return 0; 
}	
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