#include<stdio.h>
#include<conio.h>
int main()
{
  long A,B,V,W,T;
  scanf("%ld %ld %ld %ld %ld",&A,&V,&B,&W,&T);
  if((V*T)>=(W*T+(B-A)))
     printf("YES");
  else
     printf("NO");
   return 0;
     }