#include <iostream>
#include <math.h>
using namespace std;
 
int main() {
	double x, e; //Переменная и погрешность
	scanf("%lf %le", &x, &e);
	double curr = (1./4.)*log((1.+x)/(1.-x)) + (1./2.)*atan(x);  //Левая часть выражения
	int count = 0; //Счетчик
	double y = x; //i-тый слагаемое
	double sum = x; //Сумма
	for(; fabs(sum-curr) > e; count++){
		double n = (4.*count+1.)/(4.*count+5.);
		y = y*x*x*x*x*n;
		sum += y;
	}
	count++;
	printf("%d", count);
	return 0;
}

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MC45OSAxZS00

0.99 1e-4