#include <iostream>
#include <string>
#include <vector>
#include <utility>
#include <queue>
#include <deque>
#include <stack>
#include <algorithm>
#include <bitset>
#include <cstdio>
#include <cmath>

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;
    }
}
