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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  ll n, k, t;
  cin >> n >> k >> t;

  if (-t*k <= n && n <= t*k) cout << "Yes" << endl;
  else cout << "No" << endl;


}