#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(int argc, char** argv)
{
  if(argc < 3){
    printf("%s <height_camera> <theta_perpendiculer_camera>\n", *(argv+0));
    return 1;
  }
  double n = atof(*(argv+1));
  double t = atof(*(argv+2)) * M_PI / 180;
  double ta = 21.25 * M_PI / 180;

  double tb = (M_PI/2 - t) - ta;
  double t_all = ta*2 + tb;
  double m = tan(t_all) * n - tan(tb) * n;
  printf("%f\n", m);
  return 0;
}