#include <stdio.h>
#include <stdlib.h>
#include <math.h>
 
int main(void){
 
  char str[1000];
  long axisa, axisb, movea, moveb, time, judge = 0;
  fgets(str, sizeof(str), stdin);
  sscanf(str, "%ld %ld", &axisa, &movea);
  fgets(str, sizeof(str), stdin);
  sscanf(str, "%ld %ld", &axisb, &moveb);
  fgets(str, sizeof(str), stdin);
  sscanf(str, "%ld", &time);
  
  if(axisa < axisb) {
    if(axisa + movea * time >= axisb + moveb * time ){
      printf("YES\n");
    } else {
      printf("NO\n");
    }
  } else {
    if(axisa - movea * time <= axisb - moveb * time ){
      printf("YES\n");
    } else {
      printf("NO\n");
    }
  }
  
  return 0;
}