#!/usr/bin/env python3

conds = ["any", "both", "nine"]

cache = {c : {n : dict() for n in range(10)} for c in conds}

def f(n, i, contains = "both"):
    if i in cache[contains][n]:
        return cache[contains][n][i]

    if i == 1:
        if contains == "both":
            r = 0
        elif contains == "any":
            r = 1
        elif contains == "nine":
            r = (n == 9)
        cache[contains][n][i] = r
        return r

    g = lambda x,y: f(x, i-1, y)

    flag = contains

    if n == 0 or n == 9:
        if contains == "both":
            flag = "nine"
        elif contains == "nine" and n == 9:
            flag = "any"
        r = g(1, flag)
    else:
        r = g(n-1, contains) + g(n+1, contains)

    cache[contains][n][i] = r
    return r

places = 40
s = 0

for p in range(1, places+1):
    s += sum(f(n, p) for n in range(1,10))
print(s)