#include <iostream>
using namespace std;
typedef long long LL;

int main()
{
	LL N,K,T;
	cin>>N>>K>>T;
	if (N>=0){
		if (N<=K*T){
			cout<<"Yes"<<endl;
		}else{
			cout<<"No"<<endl;
		}
	}else{
		if (N>=-K*T){
			cout<<"Yes"<<endl;
		}else{
			cout<<"No"<<endl;
		}
	}
	return 0;
}