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

int main() {
    int n, k, t;
    cin >> n >> k >> t;
    n = abs(n);
    string out = "No";
    if(n / k < t) out = "Yes";
    else if(n / k == t && n % k == 0) out = "Yes";

    cout << out << '\n';

    return 0;
}