#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>

using namespace std;


int main(void)
{
    string s;
    cin >> s;

    if (s[0] == '7' || s[1] == '7' || s[2] == '7')
    {
        cout << "Yes" << endl;
    }
    else {
        cout << "No"<< endl;
    }
    
    return 0;
}
