#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<stack>
#include<set>

using namespace std;

long long x = 1000000007;


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