#include <bits/stdc++.h>
using namespace std;
int main()
{
    
   int n,c=0;
   string s;
   cin>>s;
  
  
   if(s[0]=='7' ||s[1]=='7' || s[2]=='7')
   {
       c++;
   }
   
   if(c>0)
   {
       cout<<"Yes";
   }
   else
   cout<<"No";
    return 0;
}
