/*author @sushil*/
#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define sushil ios_base::sync_with_stdio(false);cin.tie(NULL);
#define test() long long t;cin>>t;while(t--)
using namespace std;
int main()
{
  string s;
  cin>>s;
  if(s[0]=='7'||s[1]=='7'||s[2]=='7')
  cout<<"Yes";
  else
  cout<<"No";
}
