N = int(input())
c = 0

def bracket(s):
    sl = s.count("(")
    sr = s.count(")")
    if sl == sr and sl != N and sr != N:
        bracket(s+"(")
    elif sl != N and sr != N:
        bracket(s+"(")
        bracket(s+")")
    elif sr != N:
        bracket(s+")")
    else:
        global c
        c += 1
bracket("(")
print(c)