#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
int main()
{
	long long a=0,v=0,b=0,w=0,t=0;scanf("%lld%lld%lld%lld%lld",&a,&v,&b,&w,&t);
	puts(abs(a-b)<=(v-w)*t?"YES":"NO");
}