#include <bits/stdc++.h>
using namespace std;
string s;
long long  k;

int main(){
    cin>>s;
    for(int i=0;i<s.size();i++){
       if(s[i]=='7')k++;

    }
if(k>0)cout<<"Yes";
else cout<<"No";

    return 0;}



#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;

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


