#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() {
int n;cin >> n;
string s;
s = to_string(n);
if (s[0]=='7'||s[1]=='7'||s[2]=='7')
{
   cout << "Yes" << endl;

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

return 0;
}


