#include <bits/stdc++.h>

using namespace std;

#define int long long

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    string s;
    cin >> s;
    if (s[0] == '7' || s[1] == '7' || s[2] == '7')
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }
    return 0;
}
