from math import floor


def decimal_binary_form(n, limit):
    n = n - floor(n)
    rep = "0."
    sub = 1
    pos_count = 0
    while n > 0.0 and pos_count != limit:
        sub = sub / 2
        if n - sub >= 0.0:
            rep += '1'
            n = n - sub
        else:
            rep += '0'
        pos_count += 1
    return rep


if __name__ == "__main__":
   print(decimal_binary_form(1/5, 50))