#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <math.h>
#include <algorithm>
#include <string>
#include <string.h>
#include <vector>
#include <functional>
#include <queue>

using namespace std;
typedef long long ll;

int main()
{
	char N[100];
	cin >> N;
	
	if(N[0] == '7' || N[1] == '7' || N[2] == '7'){
		cout << "Yes" << endl;
	}else{
		cout << "No " << endl;
	}
	
	return 0;
}