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

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