#include <bits/stdc++.h>

using namespace std;

using ll = long long;

constexpr char newl = '\n';

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

    ll n, k, t;
    cin >> n >> k >> t;
    n = abs(n);
    cout << ((n + k - 1) / k <= t ? "Yes" : "No") << newl;

    return 0;
}