#include <stdio.h>
#include <math.h>

int main()
{
    int operation_counter = 0;

    int n;

    printf("Input n (must be a natural number): ");
    scanf("%d", &n);

    double result = 0;

    double denominator = 1;
    double power_of_four = 1;

    operation_counter += 3; // power_of_four = 1, denominator = 1, result = 0

    operation_counter += 2; // for loop
    for (int i = 1; i <= n; i++)
    {
        denominator *= i + cos(i);
        power_of_four *= 4;

        result += (power_of_four - i) / denominator;
        operation_counter += 9; // result += (power_of_four - i) / denominator, power_of_four *= 4, denominator *= i + cos(i), i <= n, i++
    }

    printf("Result = %.7f\n", result);
    printf("Number of operations = %d\n", operation_counter);

    return 0;
}