//#include <stdio.h>
#include <math.h>
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <utility>
#include <iomanip>
using namespace std;

#define ll long long

void solve()
{
    string N;
    cin >> N;
    if (N.at(0) == '7' ||
        N.at(1) == '7' ||
        N.at(2) == '7')
    {
        cout << "Yes" << endl;
    }
    else
    {
        cout << "No" << endl;
    }

    return;
}

int main()
{
    solve();
    return 0;
}
