753
2024-08-13 15:27:18
发布于：浙江
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#include<bits/stdc++.h>
using namespace std;
long long a,ans=0,c;
long long check(long long num) {
long long cnt=1;
bool c3=0,c5=0,c7=0;
while(num) {
if(num%10 == 3) c3=1;
else if(num%10 == 5) c5=1;
else if(num%10 == 7) c7=1;
else return cnt;
num/=10;
cnt*=10;
}
if(c3 and c5 and c7) return 0;
else return 1;
}
int main() {
freopen("number.in","r",stdin);
freopen("number.out","w",stdout);
cin>>a;
for(long long i=356; i<=a; i+=c) {
c=check(i);
if(c==0) {
ans++;
i++;
}
}
cout<<ans;
fclose(stdin);
fclose(stdout);
}
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