#include <stdio.h>
#include <stdlib.h>
int main() {
    int A, V, B, W, T;
    scanf("%d %d", &A, &V);
    scanf(" %d %d", &B, &W);
    scanf(" %d", &T);
    if(V * T - B * W >= abs(A = B)) {
        printf("YES");
    } else {
        printf("NO");
    }
}