#include <iostream>

using namespace std;

int main()
{
   int N,a,b,c;
   cin >> N;
   a = N/100;
   c = N%10;
   b = (N/10)%10;
   if(a == 7 || b == 7 || c == 7 ) cout << "Yes";
   else cout << "No";
   
   return 0;
}