using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication6
{
    class Program
    {
        static void Main(string[] args)
        {
            var rl = RL();
            //var sprlst = spr(rl);
            //var intlist = sprlst.Select(x => c2i(x)).ToList();
            var k = c2i(rl);
            //var ls1 = Enumerable.Range(0, 10).Select(x => (long)x);

            bool ret = false;
            int cy = 7;
            if (k % 10 == cy) ret = true;
            if ((k / 10) % 10 == cy) ret = true;
            if ((k / 100) % 10 == cy) ret = true;


            Console.WriteLine(bool2ret(ret));
           // Console.ReadLine();
            




        
        }
        static string RL() { return Console.ReadLine().Trim(); }
        static IEnumerable<string> spr(string s) { return s.Split(' '); }
        static Int64 c2i(string c) { return Int64.Parse(c); }
        //static double c2d(string c) { return double.Parse(c); }
        static string bool2ret(bool b) { return b ? "Yes" : "No"; }
    }
}
