#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define all(container) container.begin(),container.end()
#define fast ios::sync_with_stdio(0); cin.tie(0)
// #ifndef ONLINE_JUDGE
// #include "debug.cpp"
// #endif
#define int long long
const int mod = 1e9+7;  
int power(int a,int b) { if(b==0) return 1; int res = power(a,b/2); if(b&1) return res * res * a; else return res * res; }


int32_t main(){
    
  fast;
  string s; cin >> s;
  for(char c : s){
    if(c=='7'){
      cout << "Yes\n";
	  break;
    }
  }
  
  
  cout << "No\n";
 
  

  return 0;
}