/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2020.09.11 21:22:14
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n,k,t;cin >> n >> k >> t;
    n = abs(n);
    if ((n + k - 1) / k <= t) {
        puts("Yes");
    }
    else {
        puts("No");
    }
    return 0;
}