#include <stdio.h>

int main()
{
  int n, k, f=1;
  double K=0.0;

  scanf("%d", &n);

  for (k=0; k<=n; k++) {
    K += (double)f/(2*k+1);
    if (f>0)
      printf("K_%d = %g\n", k/2, K);
    f = -f;
  }

  return 0;
}