include

int main() {
int n;
double product = 2.0/3;

std::cout << "Enter the value of n: ";
std::cin >> n;
for (int i = 1; i <= n; i++) {
product *= (2*i)/(2*i + 1.0);
}
std::cout << "The product is: " << product << std::endl;
return 0;

}