111

#include <iostream>

using namespace std;

int main() {
	float a = 2;
	float b = 4;
	float c=0;
	c = c + (1 / a) - (1 / b);
	while (b != 24) {

		b += 4;
		a += 4;
		c = c + (1 / a);
		c = c - (1 % b);

}
	cout << round(c*100)/100 << endl;
	system("pause");
	return 0;
}