cnt = 0

for i in range(231832, 767346+1):

    digits = [int(digit) for digit in str(i)]

    decreases = False
    double = False

    for j in range(len(digits)-1):
        if(digits[j+1] < digits[j]):
            decreases = True

        if(digits[j+1] == digits[j]):
            if((j == 0 or digits[j-1] != digits[j]) and (j == len(digits)-2 or digits[j+2] != digits[j])):
                double = True

    if decreases or not double:
        continue

    cnt += 1

print(cnt)