#include<iostream>
#include<string>
using namespace std;
int main()
{
	string n;
	cin >> n;
	if (n[0] == '7' || n[1] == '7' || n[2] == '7') {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}
	return 0;
}
