#include<stdio.h>
 
int main(void){
  
  int A,B,V,W,T;
  printf("%d",&A);
  printf("%d",&V);
  printf("%d",&B);
  printf("%d",&W);
  printf("%d",&T);  
  if ( (( A - B) + ( V - W )*T ) >= 0 ){
    printf("YES");
  }else{
    printf("NO");
  }
  
  return 0;
}