def main():
    P = int(input())
    M = 2 ** P - 1

    a = M
    b = []
    for x in range(P - 1):
        b.append(a % 2)
        a = a // 2

    total = 1
    for x in range(P - 1):
        total += b[x]

    print(total)

if __name__ == "__main__":
    main()