#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<queue>
#include<cmath>
#include<map>
#include<stack>
#define ll long long
#define rep(i,n) for (int (i) = 0; (i) < (n); ++(i))
using namespace std;
static const int MAXN = 100000;
static const int MAX = 1000000000;

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

    return 0;
}