import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	}

	static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	}
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	}

	static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	}
} Main public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	} main {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	} InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) ALucky7 solver = new ALucky7(); solver new ALucky7() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	} ALucky7 public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		} solve {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		} String num = in.next(); num in.next() in.next in boolean ok = false; ok false for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			} char ch num.toCharArray() num.toCharArray num {
				if (ch == '7') {
					ok = true;
					break;
				}
			} {
				if (ch == '7') {
					ok = true;
					break;
				}
			} if (ch == '7') {
					ok = true;
					break;
				} ch == '7' ch '7' {
					ok = true;
					break;
				} ok = true ok true break; out.print(ok ? "Yes" : "No") out.print out ok ? "Yes" : "No" ok "Yes" "No" int testNumber testNumber Scanner in in PrintWriter out out public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	}

	static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	}
} public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	}

	static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	}
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
	public static void main(String[] args) {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		Scanner in = new Scanner(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		ALucky7 solver = new ALucky7();
		solver.solve(1, in, out);
		out.close();
	}

	static class ALucky7 {
		public void solve(int testNumber, Scanner in, PrintWriter out) {
			String num = in.next();
			boolean ok = false;
			for (char ch : num.toCharArray()) {
				if (ch == '7') {
					ok = true;
					break;
				}
			}

			out.print(ok ? "Yes" : "No");
		}

	}
}

