import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} Main public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    } main {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String n = sc.next(); n sc.next() sc.next sc if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        } n.indexOf("7") == -1 n.indexOf("7") n.indexOf n "7" -1 1 {
            System.out.println("No");
        } System.out.println("No") System.out.println System.out System System.out "No" {
            System.out.println("Yes");
        } System.out.println("Yes") System.out.println System.out System System.out "Yes" String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        String n = sc.next();
        if (n.indexOf("7") == -1) {
            System.out.println("No");
        } else {
            System.out.println("Yes");
        }
    }
}