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