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

int main() {
  char a,b,c;
  cin >> a >> b >> c;

  // ここにプログラムを追記
  if (a == '7' || b == '7' || c == '7') {
    cout << "Yes" << endl;
  }
  else {
    cout  << "No" << endl;
  } 
  
}
