Problem:


Score : 300 points

Problem Statement

You are given an integer N. Among the integers between 1 and N (inclusive), how many Shichi-Go-San numbers (literally "Seven-Five-Three numbers") are there?

Here, a Shichi-Go-San number is a positive integer that satisfies the following condition:

When the number is written in base ten, each of the digits 7, 5 and 3 appears at least once, and the other digits never appear.

Constraints

1 \leq N < 10^9

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the number of the Shichi-Go-San numbers between 1 and N (inclusive).

Sample Input 1

575

Sample Output 1

4

There are four Shichi-Go-San numbers not greater than 575: 357, 375, 537 and 573.

Sample Input 2

3600

Sample Output 2

13

There are 13 Shichi-Go-San numbers not greater than 3600: the above four numbers, 735, 753, 3357, 3375, 3537, 3557, 3573, 3575 and 3577.

Sample Input 3

999999999

Sample Output 3

26484



Sample input:
575


Sample output:
4

Submission status: Wrong Answer

Solution code:
n753 = {
    357,
    375,
    537,
    573,
    735,
    753,
    3357,
    3375,
    3537,
    3557,
    3573,
    3575,
    3577,
    3735,
    3753,
    3755,
    3757,
    3775,
    5337,
    5357,
    5373,
    5375,
    5377,
    5537,
    5573,
    5733,
    5735,
    5737,
    5753,
    5773,
    7335,
    7353,
    7355,
    7357,
    7375,
    7533,
    7535,
    7537,
    7553,
    7573,
    7735,
    7753,
    33357,
    33375,
    33537,
    33557,
    33573,
    33575,
    33577,
    33735,
    33753,
    33755,
    33757,
    33775,
    35337,
    35357,
    35373,
    35375,
    35377,
    35537,
    35557,
    35573,
    35575,
    35577,
    35733,
    35735,
    35737,
    35753,
    35755,
    35757,
    35773,
    35775,
    35777,
    37335,
    37353,
    37355,
    37357,
    37375,
    37533,
    37535,
    37537,
    37553,
    37555,
    37557,
    37573,
    37575,
    37577,
    37735,
    37753,
    37755,
    37757,
    37775,
    53337,
    53357,
    53373,
    53375,
    53377,
    53537,
    53557,
    53573,
    53575,
    53577,
    53733,
    53735,
    53737,
    53753,
    53755,
    53757,
    53773,
    53775,
    53777,
    55337,
    55357,
    55373,
    55375,
    55377,
    55537,
    55573,
    55733,
    55735,
    55737,
    55753,
    55773,
    57333,
    57335,
    57337,
    57353,
    57355,
    57357,
    57373,
    57375,
    57377,
    57533,
    57535,
    57537,
    57553,
    57573,
    57733,
    57735,
    57737,
    57753,
    57773,
    73335,
    73353,
    73355,
    73357,
    73375,
    73533,
    73535,
    73537,
    73553,
    73555,
    73557,
    73573,
    73575,
    73577,
    73735,
    73753,
    73755,
    73757,
    73775,
    75333,
    75335,
    75337,
    75353,
    75355,
    75357,
    75373,
    75375,
    75377,
    75533,
    75535,
    75537,
    75553,
    75573,
    75733,
    75735,
    75737,
    75753,
    75773,
    77335,
    77353,
    77355,
    77357,
    77375,
    77533,
    77535,
    77537,
    77553,
    77573,
    77735,
    77753,
    333357,
    333375,
    333537,
    333557,
    333573,
    333575,
    333577,
    333735,
    333753,
    333755,
    333757,
    333775,
    335337,
    335357,
    335373,
    335375,
    335377,
    335537,
    335557,
    335573,
    335575,
    335577,
    335733,
    335735,
    335737,
    335753,
    335755,
    335757,
    335773,
    335775,
    335777,
    337335,
    337353,
    337355,
    337357,
    337375,
    337533,
    337535,
    337537,
    337553,
    337555,
    337557,
    337573,
    337575,
    337577,
    337735,
    337753,
    337755,
    337757,
    337775,
    353337,
    353357,
    353373,
    353375,
    353377,
    353537,
    353557,
    353573,
    353575,
    353577,
    353733,
    353735,
    353737,
    353753,
    353755,
    353757,
    353773,
    353775,
    353777,
    355337,
    355357,
    355373,
    355375,
    355377,
    355537,
    355557,
    355573,
    355575,
    355577,
    355733,
    355735,
    355737,
    355753,
    355755,
    355757,
    355773,
    355775,
    355777,
    357333,
    357335,
    357337,
    357353,
    357355,
    357357,
    357373,
    357375,
    357377,
    357533,
    357535,
    357537,
    357553,
    357555,
    357557,
    357573,
    357575,
    357577,
    357733,
    357735,
    357737,
    357753,
    357755,
    357757,
    357773,
    357775,
    357777,
    373335,
    373353,
    373355,
    373357,
    373375,
    373533,
    373535,
    373537,
    373553,
    373555,
    373557,
    373573,
    373575,
    373577,
    373735,
    373753,
    373755,
    373757,
    373775,
    375333,
    375335,
    375337,
    375353,
    375355,
    375357,
    375373,
    375375,
    375377,
    375533,
    375535,
    375537,
    375553,
    375555,
    375557,
    375573,
    375575,
    375577,
    375733,
    375735,
    375737,
    375753,
    375755,
    375757,
    375773,
    375775,
    375777,
    377335,
    377353,
    377355,
    377357,
    377375,
    377533,
    377535,
    377537,
    377553,
    377555,
    377557,
    377573,
    377575,
    377577,
    377735,
    377753,
    377755,
    377757,
    377775,
    533337,
    533357,
    533373,
    533375,
    533377,
    533537,
    533557,
    533573,
    533575,
    533577,
    533733,
    533735,
    533737,
    533753,
    533755,
    533757,
    533773,
    533775,
    533777,
    535337,
    535357,
    535373,
    535375,
    535377,
    535537,
    535557,
    535573,
    535575,
    535577,
    535733,
    535735,
    535737,
    535753,
    535755,
    535757,
    535773,
    535775,
    535777,
    537333,
    537335,
    537337,
    537353,
    537355,
    537357,
    537373,
    537375,
    537377,
    537533,
    537535,
    537537,
    537553,
    537555,
    537557,
    537573,
    537575,
    537577,
    537733,
    537735,
    537737,
    537753,
    537755,
    537757,
    537773,
    537775,
    537777,
    553337,
    553357,
    553373,
    553375,
    553377,
    553537,
    553557,
    553573,
    553575,
    553577,
    553733,
    553735,
    553737,
    553753,
    553755,
    553757,
    553773,
    553775,
    553777,
    555337,
    555357,
    555373,
    555375,
    555377,
    555537,
    555573,
    555733,
    555735,
    555737,
    555753,
    555773,
    557333,
    557335,
    557337,
    557353,
    557355,
    557357,
    557373,
    557375,
    557377,
    557533,
    557535,
    557537,
    557553,
    557573,
    557733,
    557735,
    557737,
    557753,
    557773,
    573333,
    573335,
    573337,
    573353,
    573355,
    573357,
    573373,
    573375,
    573377,
    573533,
    573535,
    573537,
    573553,
    573555,
    573557,
    573573,
    573575,
    573577,
    573733,
    573735,
    573737,
    573753,
    573755,
    573757,
    573773,
    573775,
    573777,
    575333,
    575335,
    575337,
    575353,
    575355,
    575357,
    575373,
    575375,
    575377,
    575533,
    575535,
    575537,
    575553,
    575573,
    575733,
    575735,
    575737,
    575753,
    575773,
    577333,
    577335,
    577337,
    577353,
    577355,
    577357,
    577373,
    577375,
    577377,
    577533,
    577535,
    577537,
    577553,
    577573,
    577733,
    577735,
    577737,
    577753,
    577773,
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    733353,
    733355,
    733357,
    733375,
    733533,
    733535,
    733537,
    733553,
    733555,
    733557,
    733573,
    733575,
    733577,
    733735,
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    733755,
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    733775,
    735333,
    735335,
    735337,
    735353,
    735355,
    735357,
    735373,
    735375,
    735377,
    735533,
    735535,
    735537,
    735553,
    735555,
    735557,
    735573,
    735575,
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    735737,
    735753,
    735755,
    735757,
    735773,
    735775,
    735777,
    737335,
    737353,
    737355,
    737357,
    737375,
    737533,
    737535,
    737537,
    737553,
    737555,
    737557,
    737573,
    737575,
    737577,
    737735,
    737753,
    737755,
    737757,
    737775,
    753333,
    753335,
    753337,
    753353,
    753355,
    753357,
    753373,
    753375,
    753377,
    753533,
    753535,
    753537,
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    753555,
    753557,
    753573,
    753575,
    753577,
    753733,
    753735,
    753737,
    753753,
    753755,
    753757,
    753773,
    753775,
    753777,
    755333,
    755335,
    755337,
    755353,
    755355,
    755357,
    755373,
    755375,
    755377,
    755533,
    755535,
    755537,
    755553,
    755573,
    755733,
    755735,
    755737,
    755753,
    755773,
    757333,
    757335,
    757337,
    757353,
    757355,
    757357,
    757373,
    757375,
    757377,
    757533,
    757535,
    757537,
    757553,
    757573,
    757733,
    757735,
    757737,
    757753,
    757773,
    773335,
    773353,
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    773533,
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    773537,
    773553,
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    775373,
    775375,
    775377,
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    775537,
    775553,
    775573,
    775733,
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    775737,
    775753,
    775773,
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    777353,
    777355,
    777357,
    777375,
    777533,
    777535,
    777537,
    777553,
    777573,
    777735,
    777753,
    3333357,
    3333375,
    3333537,
    3333557,
    3333573,
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    3333577,
    3333735,
    3333753,
    3333755,
    3333757,
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    3335337,
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    3335573,
    3335575,
    3335577,
    3335733,
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    3335773,
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    3337357,
    3337375,
    3337533,
    3337535,
    3337537,
    3337553,
    3337555,
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    3353733,
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    3357533,
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    3357577,
    3357733,
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    3357755,
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    3373335,
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    3375333,
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    3573733,
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    3575333,
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    3575533,
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    3575577,
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    3737533,
    3737535,
    3737537,
    3737553,
    3737555,
    3737557,
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    77357375,
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    77357533,
    77357535,
    77357537,
    77357553,
    77357555,
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    77357733,
    77357735,
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    77357753,
    77357755,
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    77357773,
    77357775,
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    77373335,
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    77373355,
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    77373375,
    77373533,
    77373535,
    77373537,
    77373553,
    77373555,
    77373557,
    77373573,
    77373575,
    77373577,
    77373735,
    77373753,
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    77375333,
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    77375355,
    77375357,
    77375373,
    77375375,
    77375377,
    77375533,
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    77375537,
    77375553,
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    77375753,
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    77375773,
    77375775,
    77375777,
    77377335,
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    77377355,
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    77377533,
    77377535,
    77377537,
    77377553,
    77377555,
    77377557,
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    77377575,
    77377577,
    77377735,
    77377753,
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    77377775,
    77533333,
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    77533373,
    77533375,
    77533377,
    77533533,
    77533535,
    77533537,
    77533553,
    77533555,
    77533557,
    77533573,
    77533575,
    77533577,
    77533733,
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    77533757,
    77533773,
    77533775,
    77533777,
    77535333,
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    77535337,
    77535353,
    77535355,
    77535357,
    77535373,
    77535375,
    77535377,
    77535533,
    77535535,
    77535537,
    77535553,
    77535555,
    77535557,
    77535573,
    77535575,
    77535577,
    77535733,
    77535735,
    77535737,
    77535753,
    77535755,
    77535757,
    77535773,
    77535775,
    77535777,
    77537333,
    77537335,
    77537337,
    77537353,
    77537355,
    77537357,
    77537373,
    77537375,
    77537377,
    77537533,
    77537535,
    77537537,
    77537553,
    77537555,
    77537557,
    77537573,
    77537575,
    77537577,
    77537733,
    77537735,
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    77537775,
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    77553333,
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    77553337,
    77553353,
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    77553357,
    77553373,
    77553375,
    77553377,
    77553533,
    77553535,
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    77553553,
    77553555,
    77553557,
    77553573,
    77553575,
    77553577,
    77553733,
    77553735,
    77553737,
    77553753,
    77553755,
    77553757,
    77553773,
    77553775,
    77553777,
    77555333,
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    77555337,
    77555353,
    77555355,
    77555357,
    77555373,
    77555375,
    77555377,
    77555533,
    77555535,
    77555537,
    77555553,
    77555573,
    77555733,
    77555735,
    77555737,
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    77555773,
    77557333,
    77557335,
    77557337,
    77557353,
    77557355,
    77557357,
    77557373,
    77557375,
    77557377,
    77557533,
    77557535,
    77557537,
    77557553,
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    77557733,
    77557735,
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    77573333,
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    77573353,
    77573355,
    77573357,
    77573373,
    77573375,
    77573377,
    77573533,
    77573535,
    77573537,
    77573553,
    77573555,
    77573557,
    77573573,
    77573575,
    77573577,
    77573733,
    77573735,
    77573737,
    77573753,
    77573755,
    77573757,
    77573773,
    77573775,
    77573777,
    77575333,
    77575335,
    77575337,
    77575353,
    77575355,
    77575357,
    77575373,
    77575375,
    77575377,
    77575533,
    77575535,
    77575537,
    77575553,
    77575573,
    77575733,
    77575735,
    77575737,
    77575753,
    77575773,
    77577333,
    77577335,
    77577337,
    77577353,
    77577355,
    77577357,
    77577373,
    77577375,
    77577377,
    77577533,
    77577535,
    77577537,
    77577553,
    77577573,
    77577733,
    77577735,
    77577737,
    77577753,
    77577773,
    77733335,
    77733353,
    77733355,
    77733357,
    77733375,
    77733533,
    77733535,
    77733537,
    77733553,
    77733555,
    77733557,
    77733573,
    77733575,
    77733577,
    77733735,
    77733753,
    77733755,
    77733757,
    77733775,
    77735333,
    77735335,
    77735337,
    77735353,
    77735355,
    77735357,
    77735373,
    77735375,
    77735377,
    77735533,
    77735535,
    77735537,
    77735553,
    77735555,
    77735557,
    77735573,
    77735575,
    77735577,
    77735733,
    77735735,
    77735737,
    77735753,
    77735755,
    77735757,
    77735773,
    77735775,
    77735777,
    77737335,
    77737353,
    77737355,
    77737357,
    77737375,
    77737533,
    77737535,
    77737537,
    77737553,
    77737555,
    77737557,
    77737573,
    77737575,
    77737577,
    77737735,
    77737753,
    77737755,
    77737757,
    77737775,
    77753333,
    77753335,
    77753337,
    77753353,
    77753355,
    77753357,
    77753373,
    77753375,
    77753377,
    77753533,
    77753535,
    77753537,
    77753553,
    77753555,
    77753557,
    77753573,
    77753575,
    77753577,
    77753733,
    77753735,
    77753737,
    77753753,
    77753755,
    77753757,
    77753773,
    77753775,
    77753777,
    77755333,
    77755335,
    77755337,
    77755353,
    77755355,
    77755357,
    77755373,
    77755375,
    77755377,
    77755533,
    77755535,
    77755537,
    77755553,
    77755573,
    77755733,
    77755735,
    77755737,
    77755753,
    77755773,
    77757333,
    77757335,
    77757337,
    77757353,
    77757355,
    77757357,
    77757373,
    77757375,
    77757377,
    77757533,
    77757535,
    77757537,
    77757553,
    77757573,
    77757733,
    77757735,
    77757737,
    77757753,
    77757773,
    77773335,
    77773353,
    77773355,
    77773357,
    77773375,
    77773533,
    77773535,
    77773537,
    77773553,
    77773555,
    77773557,
    77773573,
    77773575,
    77773577,
    77773735,
    77773753,
    77773755,
    77773757,
    77773775,
    77775333,
    77775335,
    77775337,
    77775353,
    77775355,
    77775357,
    77775373,
    77775375,
    77775377,
    77775533,
    77775535,
    77775537,
    77775553,
    77775573,
    77775733,
    77775735,
    77775737,
    77775753,
    77775773,
    77777335,
    77777353,
    77777355,
    77777357,
    77777375,
    77777533,
    77777535,
    77777537,
    77777553,
    77777573,
    77777735,
    77777753
}


N = int(input())

print(len([1 for n in n753 if n <= N]))