#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(void) {
    string N;
    cin >> N;

    for(int i = 0; i < 3; i++) {
        if(N[i] == '7') {
            cout << "Yes" << endl;
            return 0;
        } 
    }

    cout << "No" << endl;

    return 0;
}