#include <bits/stdc++.h>
using namespace std;

#define all(v) v.begin(), v.end()
#define rep(i, n) for (int i = 0; i < n; i++)
typedef long long ll;

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