#include <iostream>
#include <vector>
#include <algorithm>
#define rep(i, a, n) for(int i = a; i < n; i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main()
{
    string s;
    cin >> s;
    rep(i, 0, 3){
        if(s[i] == '7'){
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}
