import sys
sys.setrecursionlimit(10**5)

N = int(input())

uniq = set()

def solve(n, s=""):
    if n == N:
        uniq.add(s)
        return

    if len(s) == 0:
        solve(n+1, "()")
    else:
        solve(n+1, "(" + s + ")")
        solve(n+1, s + "()")
        if s != "()":
            solve(n+1, "()" + s)

solve(0)

print(len(uniq))