#include<iostream>
#include<vector>
#include<cmath>
#include<string>
#include<algorithm>
#include<map>
#include<utility>
#include<cstdio>
#include <bits/stdc++.h>

using namespace std;

typedef pair<long long,bool> Pair;
const long long INF = 1LL<<60;

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;

}   
