#include <stdio.h>
#include <math.h>

#define labs(a) ((a>0)?a:-a)

int main(void){
    double a,b;
    double v,w;
    double t;
    scanf("%lf %lf",&a,&v);
    scanf("%lf %lf",&b,&w);
    scanf("%lf",&t);

    if(v == w){
        printf("NO");
        return 0;
    }
    if(w>v){
        printf("NO");
        return 0;
    }

    
    (((labs(a)-labs(b))/(labs(w)-labs(v))) <= t)?printf("YES"):printf("NO");
    return 0;
}