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

double main_arctg(float x, float eps)
{
int n;
n=1;
double y=0.0;
float c=x;
while(fabs(c)>eps)
{
c=-c*x*x*x*x*(2*n-1)/(2*n+1);
y=y+c;
n++;
}
return x*y - 1;
}

int main()
{
float x,eps,y;
printf ("vvesti x,eps\n");
scanf("%f%f",&x,&eps);

printf("--------------------\n");
printf("| x | y | n |\n");
printf("--------------------\n");
y=main_arctg(x,eps);
printf("\n| %7.4f | %7.4f | %7.4f\n",x,y,eps);
printf("-----------------\n");

return 0;
}