/******************************************
* NICK : nikhilsinghh59 *
******************************************/
#include<bits/stdc++.h>
using namespace std;
#define ll long long int 
#define watch(x) cout << (#x) << " is " << (x) << endl
#define endl "\n"

#define PB push_back
#define F first
#define S second
#define all(c) (c).begin(),(c).end()
const int M = 1e9+7;

int main()
{   
    // #ifndef ONLINE_JUDGE
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
    // #endif

    string s;
    cin >> s;
    //cout << n;

    if(s[0]=='7' || s[1]=='7' || s[2]=='7') {
        cout <<"Yes";
    }
    else {
        cout << "No";
    }

    
    return 0;
}