#include<stdio.h>

#define abs(OPR) ((OPR) < 0 ? -(OPR) : (OPR))

int main(void){
    long a,v,b,w,t;
    scanf("%ld%ld%ld%ld%ld",&a,&v,&b,&w,&t);
    printf((long long)abs(b-a) <= (v-w) * (long long)t ? "YES" : "NO");
}
