#include<stdio.h>
#include<string.h>
//#include<stdlib.h>
#include<math.h>
#define N 20 

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