#include<stdio.h>

int main(void) {
  int A, B, V, W, T;
  
  scanf("%d %d", &A, &V);
  scanf("%d %d", &B, &W);
  scanf("%d", &T);
  
  long nowA, nowB;
  
  if (A > B) {
    nowA = A - V * T;
    nowB = B - W * T;
    if(nowA <= nowB) printf("YES");
    else printf("NO");
  } else if (A {
    nowA = A + V * T;
    nowB = B + W * T;
    if (nowA >= nowB) printf("YES");
    else printf("NO");
  }
  
  return 0;
}