#include using namespace std; using ll = long long; using llu = long long unsigned; vector dx = { 0, 0, -1, 1}; vector dy = {-1, 1, 0, 0}; #define MOD 1000000007 int main() { int N; cin >> N; string ret = "No"; if (10 <= N && N < 100) { ret = "Yes"; } cout << ret << endl; return 0; }