import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    }

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

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    } main {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) char[] n = sc.next().toCharArray(); n sc.next().toCharArray() sc.next().toCharArray sc.next() sc.next sc String ans = "No"; ans "No" for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        } int i = 0; int i = 0; i 0 i < n.length i n.length n n.length i++ i++ i {
            if(n[i] == '7') ans = "Yes";
        } {
            if(n[i] == '7') ans = "Yes";
        } if(n[i] == '7') ans = "Yes"; n[i] == '7' n[i] n i '7' ans = "Yes" ans "Yes" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    }

} public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    }

} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] n = sc.next().toCharArray();

        String ans = "No";
        for(int i = 0;i < n.length;i++) {
            if(n[i] == '7') ans = "Yes";
        }

        System.out.println(ans);
    }

}
