#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
template<class T>inline bool chmax(T &a, const T &b){if(a < b){a = b; return 1;}return 0;}
template<class T>inline bool chmin(T &a, const T &b){if(a > b){a = b; return 1;}return 0;}
typedef long long ll;

int main(){
  ios::sync_with_stdio(false);
  cin.tie(0);
  string S; cin >> S;
  int N = S.size();
  bool flag = false;
  REP(i, N){
    if(S[i] == '7') flag = true;
  }
  if(flag){
    cout << "Yes" << endl;
  }else{
    cout << "No" << endl;
  }
}
