#include<stdio.h>
#include<stdlib.h>

int main(){
  long int a,v,b,w,t;

  scanf("%ld %ld",&a,&v);
  scanf("%ld %ld",&b,&w);
  scanf("%ld",&t);

  if(v <= w){
    printf("NO");
    exit(0);
  }
  else{
    if(((double)labs(a-b)/(double)(v-w)) <= t)
      printf("YES");
    else
      printf("NO");
  }
}
