int main()
{
	float E,x1,x2,i=2;
	cout << "E="; cin >> E;
	x1 = 2;
	x2 = 2.25;
		while (abs(x2 - x1) > E)
		{
			x1 = x2;
			x2 = pow((1 + 1.0 / (i + 1)),i);
			i++;
		}
	cout << x2;