#include <iostream>
#include <vector>
#include <unordered_map>
#include <map>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <deque>
#include <cmath>
#include <stack>
#include <queue>
#include <string>
#include <iomanip>
#include <cstring>
#include <climits>
#include <cstdio> 

#define nl '\n'

using namespace std;

string n;

int main(){

    cin >> n;

    for(long long i = 0; i < n.length(); i++) {
        if(n[i] == '7') {
            cout << "Yes";
            return 0;
        }
    }

    cout << "No";


}
 
//g++ -std=c++14 comp.cpp -o c && c.exe
//g++ -std=c++14 comp.cpp -o c; ./c.exe
//g++ -std=c++14 comp.cpp && ./a.out

//Surely this is going to AC