#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
const ll MOD = 1000000007;
const ll INF = 1e18;
#define REP(i,n) for(int i=0;i<n;i++)
#define ALL(v) v.begin(),v.end()

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