import java.util.*;
class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
		
		String s = Integer.toString(n);
		
		if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    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);
		int n = Integer.parseInt(sc.next());
		
		String s = Integer.toString(n);
		
		if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    System.out.println("Yes");
		}
		else System.out.println("No");
		
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
		
		String s = Integer.toString(n);
		
		if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    System.out.println("Yes");
		}
		else System.out.println("No");
		
	} main {
		Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
		
		String s = Integer.toString(n);
		
		if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    System.out.println("Yes");
		}
		else System.out.println("No");
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = Integer.parseInt(sc.next()); n Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc String s = Integer.toString(n); s Integer.toString(n) Integer.toString Integer n if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    System.out.println("Yes");
		}
		else System.out.println("No"); s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7' s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7' s.charAt(0) == '7' s.charAt(0) s.charAt s 0 '7' s.charAt(1) == '7' s.charAt(1) s.charAt s 1 '7' s.charAt(2) == '7' s.charAt(2) s.charAt s 2 '7' {
		    System.out.println("Yes");
		} System.out.println("Yes") System.out.println System.out System System.out "Yes" 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);
		int n = Integer.parseInt(sc.next());
		
		String s = Integer.toString(n);
		
		if(s.charAt(0) == '7' || s.charAt(1) == '7'||s.charAt(2) == '7') {
		    System.out.println("Yes");
		}
		else System.out.println("No");
		
	}
}