import java.util.*;
 
public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                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);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              }
          }
} Main public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              }
          } main {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              }
          } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str = sc.next(); str sc.next() sc.next sc String[] str2 = str.split(""); str2 str.split("") str.split str "" if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              } "7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2]) "7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2]) "7".equals(str2[0]) "7".equals "7" str2[0] str2 0 "7".equals(str2[1]) "7".equals "7" str2[1] str2 1 "7".equals(str2[2]) "7".equals "7" str2[2] str2 2 {
                System.out.println("Yes");
              } System.out.println("Yes") System.out.println System.out System System.out "Yes" {
                System.out.println("No");
              } 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);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              }
          }
} public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                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);
            String str = sc.next();
            String[] str2 = str.split("");
              if("7".equals(str2[0]) || "7".equals(str2[1]) || "7".equals(str2[2])){
                System.out.println("Yes");
              } else {
                System.out.println("No");
              }
          }
}