#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MOD 1000000007
#define INF 1000000000000000000
#define PI 3.14159265359
#define ll long long
#define MYPOW_t int

int main(){
    ll a,b,v,w,t,time=0,dist=0;
    scanf("%lld%lld",&a,&v);
    scanf("%lld%lld",&b,&w);
    scanf("%lld",&t);
    dist=labs(a-b);
    while (time!=t&&dist!=0) {
        if (dist<v+w) {
            dist-=labs(v-w);
        }else{
            dist-=v+w;
        }
        time++;
    }
    if (dist==0) {
        printf("YES");
    }else{
        printf("NO");
    }
    return 0;
}



