#include <stdio.h>
#include <math.h>
double f(double x){
    return exp(-x*x);
}
double df(double x){
    return -2*x*exp(-x*x);
}
double adf(double x,double h){
    return (f(x+h)-f(x-h))/(2*h);
}
double a4df(double x,double h){
    return (4*adf(x,h)-adf(x,2*h))/3;
}
int main(){
    double x=1,h=1;
    for(int n=0;n<40;n++){
        //double y=f(x);
        double dy=df(x);
        double ady=a4df(x,h);
        printf("%20.10e %20.10e %20.10e\n",
            h,ady,ady-dy);
        h/=2;        
    }
    return 0;
}