// fahadmd16(IIEST Shibpur)
#include<bits/stdc++.h>
#include <algorithm>
using namespace std;

#define ll long long
#define pb push_back
#define pf push_front
#define eb emplace_back
#define mp make_pair
#define ff first
#define ss second
#define db double
#define pll pair<ll, ll>
#define ALL(a) (a).begin(),(a).end()
#define IOS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define forn(i, n) for (ll i = 0; i < n; i++)
#define forn1(i, n) for (ll i = 1; i < n; i++)
#define forab(i,a,b) for(ll i=a;i<b;i++)
#define clr(x) memset(x, 0, sizeof(x))
#define count_bit(x) __builtin_popcount(x)
#define endl "\n"
#define trace1(x)                cout<<#x<<": "<<x<<endl
#define trace2(x, y)             cout<<#x<<": "<<x<<" | "<<#y<<": "<<y<<endl
#define trace3(x, y, z)          cout<<#x<<":" <<x<<" | "<<#y<<": "<<y<<" | "<<#z<<": "<<z<<endl
#define trace4(a, b, c, d)       cout<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<endl
#define trace5(a, b, c, d, e)    cout<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<endl
#define trace6(a, b, c, d, e, f) cout<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<" | "<<#f<<": "<<f<<endl
#define trace(v) for(auto it=v.begin();it!=v.end();it++)cout<<*it<<" ";cout<<endl;
#define eps 1e-10
#define nedl endl
const ll sz = 1001;
const ll mod = 1e9 + 7;
const ll mod2 = 998244353;
typedef vector<ll> VL;
typedef vector<pll > VLL;
typedef vector<vector<ll> > VVL;

ll power(ll n, ll k, ll m) {
    ll ans = 1;
    while (k) {
        if (k & 1)ans = (ans * n) % m;
        k /= 2;
        n = (n * n) % m;
    }
    return ans;
}

int main() {
    IOS;

    ll T = 1; //cin >> T;
    while (T--) {
		string s;cin>>s;
		if(s[0]=='7'||s[1]=='7'||s[2]=='7')cout<<"Yes\n";
		else cout<<"No\n";
		
		
		
    }
    return 0;
}
