#include <iostream>
#include <string>
#include <cmath>
#include <algorithm>

using namespace std;

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