#include <bits/stdc++.h>
using namespace std;

#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define intll int long long
const int INF = 1e9;
const int MOD = 1e9 + 7;

int main() {
  string s ;
  cin >> s ;
  string ans = "No";
  rep(i,3){
    if(s.at(i) == '7')
      ans = "Yes";
  }
  
  cout << ans ;


}
