#include <iostream>
#include <vector>

static const int COUNT = 2500000;

int main() {
	std::vector<int> data{1, 2, 3, 4, 5};

	int summ = 0;
	for (int i = 0; i < COUNT; i++) {
		int idx = rand() % 10;
		if (idx < data.size()) summ += data[idx];
	}

	std::cout << double(summ) / COUNT << std::endl;

	return 0;
}