#include<bits/stdc++.h>

using namespace std;

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