#include <stdio.h>
#include <string.h>

int main(void) {
	int A,V,B,W,T,AT,BT;
	scanf("%d %d \n %d %d \n %d",&A,&V,&B,&W,&T);
	if (!(-10^9 <= A || B >= 10^9)){
		printf("ok");
		return 1;
	}
	if (!(1<=V || W<= 10^9)){
		printf("oo");
		return 1;
	}
	if(!(1<= T || T>=10^9)){
		printf("oos");
		return 1;
	}
	if(A==B){
		printf("owo");
		return 1;
	}
	AT = A+V*T;
	BT = B+W*T;
	if (AT>BT){
		printf("YES");
	}
	else
	{
		printf("NO");
	}
	
	return 0;
}
