#include <iostream>
#include <string>
#include <algorithm>
#include <functional>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cmath>
#include <tuple>
#define rep(i, n) for(i = 0; i < n; i++)
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;
}