Georg Cantor proved that rational numbers are enumerable. He uses the following table to prove this proposition:
, , , , , …
, , , , …
, , , …
, , …
, …
…
We number each term in the above table along the anti-diagonals, going back and forth. That is, the first term is , then , , then , , , then …
Input Specification
The input contains an integer ().
Output Specification
Output the term in the table.
Sample Input
7
Sample Output
1/4
Problem translated to English by .
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