#include<iostream>
#include<algorithm>
#include<cmath>
#include<cstdio>
#include<string>
#include<vector>
#include<list>
#include<set>
#include<cctype>
#define ld long double
#define ll long long int
#define ull unsigned long long int
using namespace std;
template<class T> inline bool chmax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
const long long INF=1LL<<60;
//set<int>::iterator it;


int main(void){
	ios::sync_with_stdio(false); cin.tie(0);
	
	int n,b,i,ans=0;
	cin>>n;
	ll a[]={357,375,537,573,735,753,3357,3375,3537,3557,3573,3575,3577,3735,3753,3755,3757,3775,5337,5357,5373,5375,5377,5537,5573,5733,5735,5737,5753,5773,7335,7353,7355,7357,7375,7533,7535,7537,7553,7573,7735,7753,33357,33375,33537,33557,33573,33575,33577,33735,33753,33755,33757,33775,35337,35357,35373,35375,35377,35537,35557,35573,35575,35577,35733,35735,35737,35753,35755,35757,35773,35775,35777,37335,37353,37355,37357,37375,37533,37535,37537,37553,37555,37557,37573,37575,37577,37735,37753,37755,37757,37775,53337,53357,53373,53375,53377,53537,53557,53573,53575,53577,53733,53735,53737,53753,53755,53757,53773,53775,53777,55337,55357,55373,55375,55377,55537,55573,55733,55735,55737,55753,55773,57333,57335,57337,57353,57355,57357,57373,57375,57377,57533,57535,57537,57553,57573,57733,57735,57737,57753,57773,73335,73353,73355,73357,73375,73533,73535,73537,73553,73555,73557,73573,73575,73577,73735,73753,73755,73757,73775,75333,75335,75337,75353,75355,75357,75373,75375,75377,75533,75535,75537,75553,75573,75733,75735,75737,75753,75773,77335,77353,77355,77357,77375,77533,77535,77537,77553,77573,77735,77753,333357,333375,333537,333557,333573,333575,333577,333735,333753,333755,333757,333775,335337,335357,335373,335375,335377,335537,335557,335573,335575,335577,335733,335735,335737,335753,335755,335757,335773,335775,335777,337335,337353,337355,337357,337375,337533,337535,337537,337553,337555,337557,337573,337575,337577,337735,337753,337755,337757,337775,353337,353357,353373,353375,353377,353537,353557,353573,353575,353577,353733,353735,353737,353753,353755,353757,353773,353775,353777,355337,355357,355373,355375,355377,355537,355557,355573,355575,355577,355733,355735,355737,355753,355755,355757,355773,355775,355777,357333,357335,357337,357353,357355,357357,357373,357375,357377,357533,357535,357537,357553,357555,357557,357573,357575,357577,357733,357735,357737,357753,357755,357757,357773,357775,357777,373335,373353,373355,373357,373375,373533,373535,373537,373553,373555,373557,373573,373575,373577,373735,373753,373755,373757,373775,375333,375335,375337,375353,375355,375357,375373,375375,375377,375533,375535,375537,375553,375555,375557,375573,375575,375577,375733,375735,375737,375753,375755,375757,375773,375775,375777,377335,377353,377355,377357,377375,377533,377535,377537,377553,377555,377557,377573,377575,377577,377735,377753,377755,377757,377775,533337,533357,533373,533375,533377,533537,533557,533573,533575,533577,533733,533735,533737,533753,533755,533757,533773,533775,533777,535337,535357,535373,535375,535377,535537,535557,535573,535575,535577,535733,535735,535737,535753,535755,535757,535773,535775,535777,537333,537335,537337,537353,537355,537357,537373,537375,537377,537533,537535,537537,537553,537555,537557,537573,537575,537577,537733,537735,537737,537753,537755,537757,537773,537775,537777,553337,553357,553373,553375,553377,553537,553557,553573,553575,553577,553733,553735,553737,553753,553755,553757,553773,553775,553777,555337,555357,555373,555375,555377,555537,555573,555733,555735,555737,555753,555773,557333,557335,557337,557353,557355,557357,557373,557375,557377,557533,557535,557537,557553,557573,557733,557735,557737,557753,557773,573333,573335,573337,573353,573355,573357,573373,573375,573377,573533,573535,573537,573553,573555,573557,573573,573575,573577,573733,573735,573737,573753,573755,573757,573773,573775,573777,575333,575335,575337,575353,575355,575357,575373,575375,575377,575533,575535,575537,575553,575573,575733,575735,575737,575753,575773,577333,577335,577337,577353,577355,577357,577373,577375,577377,577533,577535,577537,577553,577573,577733,577735,577737,577753,577773,733335,733353,733355,733357,733375,733533,733535,733537,733553,733555,733557,733573,733575,733577,733735,733753,733755,733757,733775,735333,735335,735337,735353,735355,735357,735373,735375,735377,735533,735535,735537,735553,735555,735557,735573,735575,735577,735733,735735,735737,735753,735755,735757,735773,735775,735777,737335,737353,737355,737357,737375,737533,737535,737537,737553,737555,737557,737573,737575,737577,737735,737753,737755,737757,737775,753333,753335,753337,753353,753355,753357,753373,753375,753377,753533,753535,753537,753553,753555,753557,753573,753575,753577,753733,753735,753737,753753,753755,753757,753773,753775,753777,755333,755335,755337,755353,755355,755357,755373,755375,755377,755533,755535,755537,755553,755573,755733,755735,755737,755753,755773,757333,757335,757337,757353,757355,757357,757373,757375,757377,757533,757535,757537,757553,757573,757733,757735,757737,757753,757773,773335,773353,773355,773357,773375,773533,773535,773537,773553,773555,773557,773573,773575,773577,773735,773753,773755,773757,773775,775333,775335,775337,775353,775355,775357,775373,775375,775377,775533,775535,775537,775553,775573,775733,775735,775737,775753,775773,777335,777353,777355,777357,777375,777533,777535,777537,777553,777573,777735,777753,3333357,3333375,3333537,3333557,3333573,3333575,3333577,3333735,3333753,3333755,3333757,3333775,3335337,3335357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	for(i=0;i<=26484;i++){
//		cout<<n<<" "<<a[i]<<endl;
		if(n<a[i]){
			cout<<i<<endl;
			return 0;
		}
	}
	cout<<ans<<endl;
	
	return 0;
}


Measured memory_bytes: 512