#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;
  string ans = "No";
  rep(i,3){
    if(s[i]=='7')
      ans = "Yes";
  }
  cout << ans << endl;
  return 0;
}