#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

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