import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    }
} import java.util.*; util.* java public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    }
} Main public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    } main {
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] n = sc.next().toCharArray(); n sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No"); n[0]=='7' || n[1]=='7' || n[2]=='7' n[0]=='7' || n[1]=='7' || n[2]=='7' n[0]=='7' n[0] n 0 '7' n[1]=='7' n[1] n 1 '7' n[2]=='7' n[2] n 2 '7' System.out.println("Yes") System.out.println System.out System System.out "Yes" System.out.println("No") System.out.println System.out System System.out "No" String[] args args public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    }
} public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    }
} Main
import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	char[] n = sc.next().toCharArray();
      	if(n[0]=='7' || n[1]=='7' || n[2]=='7') System.out.println("Yes");
      	else System.out.println("No");
      	
    }
}