#include <bits/stdc++.h>
using namespace std;
#include <math.h>
#include <iomanip>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int INF=1001001001;

int main() {
  int N,K,T;
  cin>>N>>K>>T;
  if((abs(N)+K-1)/K<=T){cout<<"Yes"<<endl;}
  else{cout<<"No"<<endl;}
  return 0;  
}