#include <stdio.h>
main(){
  long long a,b, v,w, t;
  scanf("%lld %lld %lld %lld %lld", &a,&v,&b,&w,&t);
  if(v<=w){
    printf("NO");
    return 0;
  }
  double dt = (double)fabs(a-b)/(double)(v-w);
  if(dt <= t) 
    printf("YES");
  else
    printf("NO");
  return 0;
}