题解 | #挑7#
挑7
https://www.nowcoder.com/practice/ba241b85371c409ea01ac0aa1a8d957b
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n=in.nextInt();
int num=0;
for(int i=7;i<=n;i++){
if(i%7==0||String.valueOf(i).contains("7")){
num++;
}
}
System.out.println(num);
}
}
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