#include <stdio.h>

double Calc_Eps(){
    double eps = 1;
    while ((eps/2 + 1) >  1) eps /= 2;
    return eps;
}

double Calc_Row(double x, int i){
    double ch = 1;
    double zn = 4;
    double res = 0;
    double eps = Calc_Eps();
    while ((ch/zn) > eps){
        double tmp = ch / zn;
        res += tmp;
        ch *= x*x*x*x;
        zn *= 4;
        i++;
    }
    return res;
}

int main(){
    int i = 0;
    double x = 0.5;
    printf("%lf\n", x);
    x = 1/ (4 - x*x*x*x);
    printf("%.20lf\n", x);
    x = Calc_Row(x , i);
    printf("%.20lf%d" , x , i);
    return 0;
}