#include <iostream>
#include <iterator>
#include <set>
using namespace std;
int main() {
int in_number;
enum{ end_of_input_value = 0, which_from_end = 3 };
set<int> numbers;
while((cin>>in_number) && in_number != end_of_input_value)
numbers.insert(in_number);
auto it = numbers.cend();
advance(it, -which_from_end);
cout << *it;
return 0;
}
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