#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main(){
    string N;
    cin >> N;
    if (N.at(0) == '7' || N.at(1) == '7' || N.at(2) == '7') cout << "Yes" << endl;
    else cout << "No" << endl;
}