#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vi = vector<int>;
using vvi =vector<vi>;

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