PlaygroundCpp/Sources/Playground.cpp


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#include <iostream>
using std::cin;
using std::cout;

int main() {
	int bigger = 0;
	int biggest = 0;
	int n;
	int i;
	cin >> n;

	for (int j = 0; j < n; j++) {
		cin >> i;
		if (i > biggest) {
			bigger = biggest;
			biggest = i;
		} else if (i == biggest) {
			bigger = i;
		} else if (i > bigger) {
			bigger = i;
		}
	}

	int64_t prod = (int64_t) bigger * (int64_t) biggest;
	cout << prod << "\n";
	return 0;
}