# CJam, <s>77</s> <s>71</s> <s>70</s> <s>69</s> 63 bytes

    r_,3*_Sa*a*\{~"÷Ðëúܾ¿ðÿþ"=i2bS"\/"4*W<+.*3/\2fm>2m>..e>}/Wf%N*

Try it online in the [CJam interpreter][1].

[1]: http://cjam.aditsu.net/#code=r_%2C3*_Sa*a*%5C%7B~%22%C3%B7%C3%90%C3%AB%C3%BA%C3%9C%C2%BE%C2%BF%C3%B0%C3%BF%C3%BE%22%3Di2bS%22%5C%2F%224*W%3C%2B.*3%2F%5C2fm%3E2m%3E..e%3E%7D%2FWf%25N*&input=0123456789