#include <iostream>
#include <string.h>
#include<algorithm>
#include<math.h>

using namespace std;

int main()
{
	string N;
	cin >> N;
	if (N[2] == '7' || N[1] == '7' || N[0] == '7')cout << "Yes" << endl;
	else cout << "No" << endl;
	
	return 0;
}
