（练习用）挑7

import java.util.Scanner;

public class Select7 {

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();
int count = 0;
for (int i = 1; i < num; i++) {
String str = "" + i;
if(str.contains("7")||i%7==0)
count++;

}
System.out.println(count);
}

}