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

double f(double x){
    return atan(x)-1;
}
double df(double x){
    return 1/(1+x*x);
}
double g(double x){
    return x-f(x)/df(x);
}
int main(){
    double x=1.0;
    printf("#%10s %20s\n","n","x_n");
    for(int n=0;n<7;n++){
        printf("%11d %20.14g\n",n,x);
        x=g(x);
    }
    return 0;
}