#include<stdio.h>
#include<math.h>
int main(){
  int A,V,B,W,T;
  scanf("%d",&A);
  scanf("%d",&V);
  scanf("%d",&B);
  scanf("%d",&W);
  scanf("%d",&T);
  
  char ans[8] = abs(A-B) <= (V-W)*T ? "YES" : "NO";
  
  printf("%s",ans);
  
  return 0;
}