#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <numeric>
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;
}