#include <stdio.h>

const double PI = 3.141592653589793;

void main(void) {
  for (int n = 1; n <= 9; n++) {
    double pi1 = 0.0;
    for (int i = 1, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi1 += signe * 4.0 / i;
    }
    double pi2 = 3.0;
    for (int i = 2, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi2 += signe * 4.0 / (i * (i + 1LL) * (i + 2LL));
    }
    printf("%5d : %20.16lf %20.16lf : %20.16lf %20.16lf : %12.1lf\n", n
           , pi1
           , pi1 - PI
           , pi2
           , pi2 - PI
           , fabs(pi1 - PI) / fabs(pi2 - PI));
  }
  for (int n = 10; n <= 90; n += 10) {
    double pi1 = 0.0;
    for (int i = 1, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi1 += signe * 4.0 / i;
    }
    double pi2 = 3.0;
    for (int i = 2, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi2 += signe * 4.0 / (i * (i + 1LL) * (i + 2LL));
    }
    printf("%5d : %20.16lf %20.16lf : %20.16lf %20.16lf : %12.1lf\n", n
           , pi1
           , pi1 - PI
           , pi2
           , pi2 - PI
           , fabs(pi1 - PI) / fabs(pi2 - PI));
  }
  for (int n = 100; n <= 900; n += 100) {
    double pi1 = 0.0;
    for (int i = 1, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi1 += signe * 4.0 / i;
    }
    double pi2 = 3.0;
    for (int i = 2, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi2 += signe * 4.0 / (i * (i + 1LL) * (i + 2LL));
    }
    printf("%5d : %20.16lf %20.16lf : %20.16lf %20.16lf : %12.1lf\n", n
           , pi1
           , pi1 - PI
           , pi2
           , pi2 - PI
           , fabs(pi1 - PI) / fabs(pi2 - PI));
  }
  for (int n = 1000; n <= 10000; n += 1000) {
    double pi1 = 0.0;
    for (int i = 1, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi1 += signe * 4.0 / i;
    }
    double pi2 = 3.0;
    for (int i = 2, signe = 1; i <= 2 * n + 1; i += 2, signe = -signe) {
      pi2 += signe * 4.0 / (i * (i + 1LL) * (i + 2LL));
    }
    printf("%5d : %20.16lf %20.16lf : %20.16lf %20.16lf : %12.1lf\n", n
           , pi1
           , pi1 - PI
           , pi2
           , pi2 - PI
           , fabs(pi1 - PI) / fabs(pi2 - PI));
  }
}