import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    String A = sc.next();
    char a = A.charAt(0);
    char b = A.charAt(1);
    char c = A.charAt(2);;
    if(a== '7' || b== '7' || c== '7'){
      System.out.println("Yes");
    }else{
      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