#define _CRT_SECURE_NO_WARNINGS 
#include <stdio.h>
signed main(){
 
 int kyori,hayasa,a,v,b,w,t;
 
(void)scanf("%d %d",&a,&v);
(void)scanf("%d %d",&b,&w);
(void)scanf("%d",&t);
 
if(a>=b){
    kyori=a-b;
    
}else{
    kyori=b-a;
}
 
hayasa=v-w;
  
  if(hayasa<=0){
  hayasa=0;
  }
 
if(kyori>hayasa*t){    
    printf("NO\n");   
}else{
    printf("YES\n");   
}
 
 return 0 ;
    
}