#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>

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;
    }
    
    return 0;
}
