import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    boolean flag = false;
    for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    }
    
    if(flag) {
      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();
    boolean flag = false;
    for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    }
    
    if(flag) {
      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();
    boolean flag = false;
    for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    }
    
    if(flag) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    boolean flag = false;
    for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    }
    
    if(flag) {
      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 boolean flag = false; flag false for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    } int i=0; int i=0; i 0 i<S.length() i S.length() S.length S i++ i++ i {
      if(S.substring(i,i+1).equals("7")) flag = true;
    } {
      if(S.substring(i,i+1).equals("7")) flag = true;
    } if(S.substring(i,i+1).equals("7")) flag = true; S.substring(i,i+1).equals("7") S.substring(i,i+1).equals S.substring(i,i+1) S.substring S i i+1 i 1 "7" flag = true flag true if(flag) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    } flag {
      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
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    String S = sc.next();
    boolean flag = false;
    for(int i=0;i<S.length();i++) {
      if(S.substring(i,i+1).equals("7")) flag = true;
    }
    
    if(flag) {
      System.out.println("Yes");
    } else {
      System.out.println("No");
    }
  }
}