#include <iostream>
#include <string>

using namespace std;

int main()
{
	string s;
	cin >> s;

	if (s[0] == '7' || s[1] == '7' || s[2] == '7') {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}

	return 0;
}