import java.util.*;
class Main{
public static void main(String args[]){

        Scanner sc= new Scanner(System.in);
        char[] n = sc.nextLine().toCharArray();
        for(int i=0;i<3;i++){
            if(n[i]=='7'){
                System.out.println("Yes");
                return;
            }
            
        }
        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