#include <iostream>

int main()

{

std::cout << "x = ";

int x;

std::cin >> x;

std::cout << "n = ";

int n;

std::cin >> n;

double chislitel=0;

for (int i = 1; i <= n; i++) {

 chislitel = chislitel + ((x + sin(i + 2 * x)) / pow(2, i));

}

std::cout << "Answer = " << chislitel / (n + 2) << "\n";

return 0;

}