import java.util.*;

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

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