#include <algorithm>
#include <cmath>
#include <iostream>
#include <iterator>
#include <map>
#include <queue>
#include <unordered_map>
#include <vector>

using namespace std;

#define ll long long
#define el '\n'
#define rep(i, a, b) for (int i = a; i < b; i++)
#define repi(i, a, b) for (int i = a; i >= b; i--)
#define VI vector<int>
#define VII vector<pair<int, int>>
#define PII pair<int, int>
#define MP make_pair
// #define log(fmt, ...) printf(fmt, ##__VA_ARGS__)
#define log(fmt, ...)
// #define check(...) assert(##__VA_ARGS__)
#define check(...)

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    string n;
    cin >> n;
    bool has = false;
    rep(i,0,n.length()) {
        if (n[i] == '7') {
            has = true;
        }
    }
    if (has) {
        cout << "Yes";
    }else {
        cout << "No";
    }
}
