#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main()
{
    string n;
    cin >> n;
    if (n[0] == '7')
    {
        cout << "Yes" << endl;
    }
    else if (n[1] == '7')
    {
        cout << "Yes" << endl;
    }
    else if (n[2] == '7')
    {
        cout << "Yes" << endl;
    }
    else
        cout << "No" << endl;

    return 0;
}