#include<iostream>

using namespace std;

int main() {
	char*N = new char[3];

	cin >> N;

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

	return 0;
}