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

using ll=long long;

const int MAX = 2200000;
const long long MOD = 1000000007;
long long INF = 90000000001000;


int main() {
string n;cin >> n;

if (n[0]=='7'||n[1]=='7'||n[2]=='7')
{
   cout << "Yes" << endl;

}
else cout << "No" << endl;




return 0;
}


