#include<bits/stdc++.h>
using namespace std;
//将整数转换为string 
string tos(int n){
    string s = "";
    while(n != 0){
        s = (char)(n % 10 + 48) + s;
        n = n / 10;
    }
    return s;
}
 
int main(){
    int i,n,c = 0;
    string s;
    cin>>n;
    for(i = 1;i <= n;i++){
        s = tos(i);
        if(i % 4 == 0 || i % 7 == 0 || (s.find("44") != -1 || s.find("77") != -1)){
            c++;
        }
    }
    cout<<c<<endl;
     
    return 0;
}


/**************************************************************
	Problem: 1554
	User: admin
	Language: C++
	Result: Accepted
	Time:435 ms
	Memory:2076 kb
****************************************************************/