#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;
  bool ans = false;
  rep(i, 3) {
    if (S[i] == '7') {
      ans = true;
      break;
    }
  }

  if (ans) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
  
  return 0;
}
