#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	ll n, k, t;
	cin >> n >> k >> t;

	string res = (abs(n) + k - 1) / k <= t ? "Yes" : "No";
	cout << res << "\n";

	return 0;
}