#include <iostream>
#include <string>

using namespace std;

int main(){
	string s;
	cin >> s;
	for (int i = 0; i < 3; i++)
	{
		if(s[i] == '7'){
			cout << "Yes" << endl;
			return 0;
					}
		/* code */
	}
	cout << "No" << endl;
	return 0;
	
}
