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