#include <stdio.h>
int main (void)
{
    int a, v, b, w, t;
    int dif_fast, dif_dis;

    scanf("%d %d %d %d %d", &a, &v, &b, &w, &t);
    dif_fast = v - w;
    dif_dis = b - a;
    if (dif_dis < 0) dif_dis *= -1;
    if(dif_fast <= 0)   
        {
            puts("NO");
            return(0);
        }

    if(dif_dis / dif_fast <= t)
        puts("YES");
    else puts("NO");
    return(0);
}