import java.util.Scanner;

public class Main {
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
    	int N = sc.nextInt();
      	boolean res = false;
      	while(N>0){
          	int x = N%10;
          	if(x==7){
            	res = true;
              	break;
            }
          	N/=10;
        }
      	if(res) System.out.print("Yes");
      	else System.out.print("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