#include <iostream>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <vector>
#include <set>
#include <cstdlib>

using namespace std;

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