#include <bits/stdc++.h>
using namespace std;
int main()
{
    int n , k ,t;
    cin >> n >> k >> t;
    n = abs(n);
    int canGo = (n/k);
    if(n%k) canGo++;

    if(canGo<=t)cout<<"Yes\n";
    else cout<<"No\n";
    return 0;
}