#include <iostream>
#include<string>
using namespace std;

int main(void){
   string s;
   
   cin >> s;
   
   for(int i = 0; i < s.length(); i++){
       if(s[i] == '7'){
           cout << "Yes" << endl;
           return 0;
       }
   }

    cout << "No" << endl;
    return 0;
}
