/*

Coded and Decoded by : Yash Kapoor

*/
#include <bits/stdc++.h>
using namespace std;

#define ll          long long
#define ld          long double
#define pb          push_back
#define pf          push_front
#define mp          make_pair
#define pll         pair<ll,ll>
#define vl          vector<ll>
#define sl          set<ll> 
#define vll         vector<pll>
#define ml          map<ll,ll>
#define mll         map<pll,ll>
#define all(a)      a.begin(),a.end()
#define x           first
#define y           second
#define sz(x)       (ll)x.size()
#define dl          '\n'
//#define why         (ll)1000000007
#define why         (ll)998244353
#define lp(i,a,b)   for(ll i=a;i<b;++i)
#define lpr(i,a,b)  for(ll i=a;i>=b;i--)
#define lpd(i,x)    for(auto i:x)
#define ios         ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
ll inf = 1e18;
ld pi = 3.141592653589;
ll mod = why;
ll fast_power(ll base,ll power,ll mod)
{
    ll result=1;
    while(power)
    {
        if(power%2)
        result=(result*base)%mod;
        base=(base*base)%mod;
        power/=2;
    }
    return result;
}

ll inverse(ll base,ll mod)
{
    return fast_power(base,mod-2,mod);
}

ll solve(){ 
    ll n; cin>>n;
    while(n){
        if(n%10 == 7){
            cout<<"Yes";
            return 0;
        }
        n/=10;
    }
    cout<<"No";
}  

int main(){
    ios
    ll t=1; 
    //cin>>t;
    while(t--){
        solve();
    }
}