#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;

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

	if(N.at(0) == '7' || N.at(1) == '7' || N.at(2) == '7')
		cout << "Yes" << endl;
	else
		cout << "No" << endl;

	return 0;
}