
#include <bits/stdtr1c++.h>
using namespace std;

int main() {int n,k,l,o;


      cin>>n;
      n/100=k;
        (n-k*100)/10=l;
        (n-k*100-l*10)=o;
      if(k=7||l=7||o=7){
      cout<<"Yes"<<endl;
      }
      else{cout<<"No"<<endl;}
    }