#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(void) {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(15);

    ll N;
    cin >> N;

    if (10 <= N && N < 100) {
        cout << "Yes\n";
    } else {
        cout << "No\n";
    }
}