#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>
#include <string>
#include <array>
#include <cmath>
#include <queue>
#include <stack>
#include <numeric>
using namespace std;
int main() {
	string n;
	cin >> n;
	if (n[0] == '7' || n[1] == '7' || n[2] == '7') cout << "Yes" << endl;
	else  cout << "No" << endl; 	
}