#include <iostream>
#include <string>

using namespace std;

int main(void){
  string s;
  cin >> s;
  int len = s.length();
  for(int i=0;i<len;i++){
    if(s[i] == '7'){
      cout << "Yes" << endl;
      return 0;
    }
  }
    cout << "No" << endl;
    return 0;
}
