#include <bits/stdc++.h>
using namespace std;
int main(){
  int N,a,b,c;
  cin>>N>>;
  a=N/100;
  b=(N-a*100)/10;
  c=(N-a*100-b*10);
  if(a==7||B==7||c==7)cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
}
