#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; typedef pair<int, int> Pii; typedef pair<int, ll> Pil; typedef pair<ll, ll> Pll; typedef pair<ll, int> Pli; typedef vector < vector<ll> > Mat; #define fi first #define se second const ll MOD = 1e9 + 7; const ll MOD2 = 998244353; const ll MOD3 = 1812447359; const ll INF = 1ll << 62; const double PI = 2 * asin(1); void yes() {printf("yes\n");} void no() {printf("no\n");} void Yes() {printf("Yes\n");} void No() {printf("No\n");} void YES() {printf("YES\n");} void NO() {printf("NO\n");} int main(){ ll N, K, T; cin >> N >> K >> T; ll ans = abs(N) / K; if (abs(N) % K != 0) ans++; if (T >= ans) Yes(); else No(); return 0; }