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

int main() {
    int n, k, t;
    cin >> n >> k >> t;
    if(n<0)
        n = -n;

    if ((n + k - 1) / k <= t)
        cout << "Yes";
    else
        cout << "No";
    cout << endl;

    return 0;
}