#include <iostream>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define REP(j, m) for (int j = 0; i < (int)(n); j++)
using ll = long long;
using namespace std;

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