static void DemoConcurrency_Safe() {
Console.WriteLine("=== DemoConcurrency_Safe ===");
int sum = 0;
int[] results = new int[10];
Parallel.For(0, 10, (index) => {
	results[index] = Operation(index);
});
sum = results.Sum();
Console.WriteLine("Vsledn souet: {0}", sum);
}
