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