

Input

The input contains a single integer a (1 ≤ a ≤ 30).

Output

Output a single integer.

Example

Input

3


Output

27
#!/usr/bin/python

class a :

    def __init__ (self) :

        self . a = input ()



    def b (self) :

        if 1 <= self . a <= 30 :
                     
            c = [ 4, 22, 27, 58,85,94,121,166,202,265,274,319,346,355,378,382,391,438,454,483,517,526,535, 562,576,588,627,634,636,645 ]
            print c [ self . a - 1 ]



if __name__ == '__main__' :

    a () . b () 
