#include <stdio.h>
#include <math.h>
#define OK 0
#define WRONG_INP 1
#define ZERO 0
#define ONE 1
#define TWO 2
#define THREE 3

float sequence_sum(float x, float epsilon)
{
    float x1 = x;
    float x2 = -(pow(x, THREE) / THREE);
    float sum = x2 + x1;
    int i = 1;
    while (fabs(x2 - x1) > epsilon)
    {
        ++i;
        x1 = x2;
        x2 = pow(-1, i) * pow(x, TWO * i + ONE) / (TWO * i + ONE);
        sum += x2;
    }
    return sum;
}

float abs_val(float x)
{
    return atan(x);
}

int inp_check(float eps)
{
    if (eps <= ZERO || eps > ONE)
        return WRONG_INP;
    return OK;
}

int main()
{
    float x, eps, val, absolute_val;
    int rc;
    rc = scanf("%f %f", &x, &eps);
    if (rc != TWO)
        return WRONG_INP;
    if (inp_check(eps) == ONE || x < -ONE || x > ONE)
        return WRONG_INP;

    val = sequence_sum(x, eps);
    absolute_val = abs_val(x);
    printf("Приблизительное значение %f  %f\n", eps, val);
    printf("Точное значение %f\n", absolute_val);
    printf("Абсолютная ошибка %f\n", fabs(absolute_val - val));
    printf("Приблеженная ошибка %f\n", fabs(absolute_val - val) / absolute_val);
    return OK;
}