import java.util.*;


public class Main {
    public static void main(String[] args) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} Main public static void main(String[] args) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    } main {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    } boolean b = false; b false char c = '7'; c '7' Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      } int i =0; int i =0; i 0 i < n.length() i n.length() n.length n i++ i++ i {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      } {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      } if (n.charAt(i) == c) {
          b = true;
          break;
        } n.charAt(i) == c n.charAt(i) n.charAt n i c {
          b = true;
          break;
        } b = true b true break; if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      } b {
        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) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} public class Main {
    public static void main(String[] args) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
} Main
import java.util.*;


public class Main {
    public static void main(String[] args) {
      
      boolean b = false;
      char c = '7';
      
      Scanner sc = new Scanner(System.in);
      String n = sc.next();
      for (int i =0; i < n.length(); i++) {
        if (n.charAt(i) == c) {
          b = true;
          break;
        }
      }
      if (b) {
        System.out.println("Yes");
      } else {
        System.out.println("No");
      }
    }
}