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