possible = 0
for pas in range(138241, 674034 + 1):

    pas = str(pas)
    rule1 = False
    for x in range(0, 5):
        if pas[x] == pas[x + 1]:
            if x == 0 and pas[x + 2] != pas[x]:
                rule1 = True
                break
            if x > 0 and x < 4 and pas[x + 2] != pas[x] and pas[x - 1] != pas[x]:
                rule1 = True
                break
            if x == 4 and pas[x - 1] != pas[x]:
                rule1 = True
                break
    if rule1 == False:
        # print("breaks rule 1")
        continue

    rule2 = True
    for x in range(0, 5):
        if pas[x] <= pas[x + 1]:
            continue
        else:
            rule2 = False
            break
    if rule2 == False:
        # print("breaks rule 2")
        continue

    # print(pas)
    # print("good")
    # print("-")
    possible += 1

print(possible)