#include<iostream>
#include<cstring>

using namespace std;

int main() {
	char a, b, c;
	cin >> a >> b >> c;
	if (a == '7' || b == '7' || c == '7') {
		cout << "Yes\n";
	}
	else {
		cout << "No\n";
	}
	return 0;
}