#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;
}