#include <iostream>

using namespace std;

int main(){
  string n;
  std::cin >> n;
  if(n[0] == '7' || n[1] == '7' || n[2] == '7'){
    std::cout << "Yes" << '\n';
  }else{
    std::cout << "No" << '\n';
  }
  return 0;
}
