#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 N;
  cin >> N;
  int flag = 0;
  rep(i,3){
    if(N.at(i)=='7') flag = 1; 
  }
  if(flag) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}