d = {}
def get(x,r,f):
    if (x,r,f) in d: return d[x,r,f]
    if x < 0: return 0
    if x==0: return 1 if r == 0 or f == 1 else 0
    res = sum(get((x-i)//10, (r-i)%3, f|(i==3)) for i in range(10))
    d[x,r,f] = res
    return res

n = int(input())
print(get(10**n,0,0)-1)