from sys import argv
from sys import exit

def dec2bin(x):
  power=0
  bin=""
  dec=x

  while 1:
    if dec >= (2 ** power):
      power = power + 1
    else:
      power = power - 1
      break

  while power >= 0:
    if dec >= (2 ** power):
      bin=bin + "1"
      dec = dec - (2 ** power)
    else:
      bin=bin + "0"

    power = power - 1

  return bin