#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;

int main() {
    ll N, K, T;
    cin >> N >> K >> T;

    ll diff = abs(N);
    ll time = (diff + K - 1) / K;
    if (time <= T) {
        cout << "Yes" << endl;
    } else {
        cout << "No" << endl;
    }

    return 0;
}