import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) String S = sc.next(); S sc.next() sc.next sc int seven = 0; seven 0 String[] list = S.split("", 0); list S.split("", 0) S.split S "" 0 for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		} String num list {
			if(num.equals("7")) {
				seven++;
			}
		} {
			if(num.equals("7")) {
				seven++;
			}
		} if(num.equals("7")) {
				seven++;
			} num.equals("7") num.equals num "7" {
				seven++;
			} seven++ seven if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		} seven == 0 seven 0 {
			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) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String S = sc.next();
		int seven = 0;

		String[] list = S.split("", 0);

		for (String num : list) {
			if(num.equals("7")) {
				seven++;
			}
		}
		if(seven == 0) {
			System.out.println("No");
		}else {
			System.out.println("Yes");
		}
	}
}
