#include<bits/stdc++.h>
using namespace std;
#define int long long int 
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define vi vector<int>
#define pi pair<int,int>
#define all(v) v.begin(),v.end()
#define zeros(arr) memset(arr,0,sizeof(arr));
#define precise(num)  cout<<fixed; cout << std::setprecision(num)
#define nl cout<<"\n";
#define test int t;cin>>t;while(t--) 
const int maxx  = 3*1e5 , limit = 1e17 , MOD=1e9+7;
#define boost  ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int32_t main(){
    boost;
    string s;
    cin>>s;
    if(s[0] =='7'||s[1] =='7'||s[2] =='7'){
        cout<<"Yes\n";
    }else
    cout<<"No\n";
}