#include <iostream>
#include <cmath>

using namespace std;

int main() {
	double x, eps, sum = 0.0;
	do {
		cout << "Введите x = ";
		cin >> x;
		if (x == 0) {
			cout << "Неверное значение x\n";
		}
	} while (x == 0);
	do {
		cout << "Введите eps = ";
		cin >> eps;
		if (eps <= 0 || eps >= 1) {
			cout << "Неверное значение eps\n";
		}
	} while (eps <= 0 || eps >= 1);
	double u = 1;
	int k = 1;
	do {
	    if (k == 1) {
	        cout << "U0 = 0\n";
	    }
		else {
		    u *= (-x * x) * pow(k - 1, 3) / (pow(k, 3) * (k + 1));
	    	sum += u;
	    	cout << "U" << (k - 1) << " = " << u << endl;
	    }
	    k++;
	} while (abs(u) > eps);
	cout << "Сумма ряда = " << sum << "; Количество элементов = " << (k - 1) << endl;
	return 0;
}