int main(void){
  int A,B,V,W,T;
  scanf("%d %d",&A,&V);
  scanf("%d %d",&B,&W);
  scanf("%d",&T);
  
  //printf("A:%d V:%d B:%d W:%d T:%d\n",A,V,B,W,T);
  int j=V-W;
  int dist=abs(A-B);
  //printf("j:%d dist:%d\n",j,dist);

  if(j*T>=dist)
    puts("YES");
  else
    puts("NO");
  
}