#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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