#include <bits/stdc++.h>
using namespace std;
#define IOS ios_base::sync_with_stdio(false);cin.tie(0)
#define pb push_back
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define int long long
const int MOD=1e9+7;
const int N=3e5+10;
int32_t main()
{
	string s;
    cin>>s;
    int k=s.count(all(s),'7');
    cout<<(k>=1?"YES":"NO")<<endl;



}