#include<stdio.h>

int main (void)
{
  long long int a,b,v,w,t;
  
  scanf("%lld %lld %lld %lld %lld", &a,&v,&b,&w,&t);
  
  if(a+v*t>=b+w*t)
    printf("Yes");
  else
    printf("No");
  
  return 0;
}
