#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string>
#include <algorithm>
#include <math.h>
#include <map>
#include <vector>
#include <list>
#include <queue>
#include <stack>

using namespace std;


int main() {
	string s;
	cin >> s;
	if (s[0] == '7' || s[1] == '7' || s[2] == '7')cout << "Yes" << endl;
	else cout << "No" << endl;


	return 0;
}

