# [pug-pe] Proposta de problema para um possivel Dojo - 27/11/2010
# Autoria: Genivaldo Gueiros

def problema(entrada):
    soma=0
    falhou=1
    for i in range(len(entrada)):
        soma+=int(entrada[i])
        try:
            if entrada[i]==entrada[i+1]:falhou=0
        except:
            break
    return sum([((soma%2)==0),falhou,str(entrada[0])!=str(entrada[len(entrada)-1])])

# Validando
amostra=[215228, 218415, 221632, 224722, 229644, 230847, 233798, 237903, 239224, 241832, 242112, 243248, 246147, 247652, 250688, 252940, 255721, 256882, 259134, 262578, 263327, 266656, 268796, 270350, 272863, 275245, 278601, 278606, 281963, 283751, 288259, 291562, 296545, 298528, 302103, 303431, 307561, 311979, 315548, 320440, 322278, 324469, 324740, 327417, 330263, 331179, 334147, 334932, 336085, 338096, 338106, 342991, 347187, 347590, 348863, 350187, 353246, 354032, 358616, 363056, 363251, 366141, 369906, 371046, 372684, 377077, 381177, 382086, 385627, 385694, 386105, 388179, 390251, 392624, 394225, 395328, 398698, 400102, 404224, 408064, 410386, 411711, 413621, 415653, 417168, 419269, 424197, 427202, 430639, 432570, 437462, 442412, 444990, 447613, 452039, 456750, 459927, 462532, 465756, 467051, 468297, 469089, 471562, 474900, 475534, 476833, 478910, 480437, 482085, 485647, 487736, 489897, 493033, 495182, 498463, 502539, 502785, 505926, 508246, 511720, 515395, 515595, 516362, 520927, 525025, 529957, 530139, 531015, 533760, 534588, 538184, 541403, 542913, 546141, 548038, 549095, 552509, 556808, 560382, 563503, 565304, 567165, 567675, 572218, 573856, 576408, 578085, 578997, 579553, 584487, 589220, 590967, 593234, 597867, 599823, 603666, 607878, 611482, 611854, 612811, 614119, 615956, 617547, 621070, 621309, 626105, 626885, 631080, 635911, 639606, 640175, 641607, 645158, 647958, 652199, 656507, 658615, 662663, 662947, 664704, 666668, 667544, 669440, 673512, 675931, 676963, 677113, 678606, 682716, 682998, 684883, 686140, 688963, 689054, 692042, 695458, 697031, 697457, 697623, 698026]

contador=0
for elemento in amostra:
    elemento=str(elemento)
    if (problema(elemento)==3):contador+=1
print contador