#include <bits/stdc++.h>
using namespace std;

int main() {
  string N;
  cin >> N;
  
  for(int i = 0; i < 3; i++) {
    if(N.at(i) == '7') {
      cout << "Yes" << endl;
      break;
    }
    else if(i == 2) {
      cout << "No" << endl;
    }
  }
}