题解 | #挑7#

public class Main{
	public static void main(String[] args) {		Scanner sc = new Scanner(System.in);
		while(sc.hasNext()){
			int count = 0;
			int a = sc.nextInt();
			for(int i=1;i<=a;i++){
				if(i%7==0){
					count++;
					continue;
				}
				if(new Integer(i).toString().contains("7")){
					count++;
				}
			}
			System.out.println(count);
		}
	}
}