#include <iostream>
using namespace std;
int main()
{
int n, A[1003];
int l = -1;
cin >> n;
for(int i = 0; i < n; i++){
cin >> A[i];
}
for(int g = 0; g < n; g++){
if(A[g] > l){
l = A[g];
}
}
cout << l;
}
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