import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
} Main public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    } main {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String str1 = sc.next(); str1 sc.next() sc.next sc String str2 = "7"; str2 "7" int result = str1.indexOf(str2); result str1.indexOf(str2) str1.indexOf str1 str2 if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        } result != -1 result -1 1 {
            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);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
} public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        // 整数の入力
        String str1 = sc.next();
        // スペース区切りの整数の入力

        String str2 = "7";

        int result = str1.indexOf(str2);
        if (result != -1) {
            System.out.println("Yes");
        } else {
            System.out.println("No");
        }

    }
}
