import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
  	Scanner in = new Scanner(System.in);
    
    int n = in.nextInt();
    while (n != 0) {
      if (n % 10 == 7) {
      	System.out.println("Yes");
        break;
      }
      n /= 10;
    }
    
    if (n == 0) {
      System.out.println("No");
    }
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz