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

int main()
{
   long int A,V,B,W,T;
    scanf("%ld %ld %ld %ld %ld",&A,&V,&B,&W,&T);
 if(V<=W)
 {printf("NO");return 0;}
 V=V-W;
 if(A<=0)
 A=B-A;
 else
 A=A-B;
 if(A/V<=T)
 printf("YES");
 else printf("NO");
 return 0;
}