#include<stdio.h>
int main()
{
	int m;
	scanf("%d", &m);
	int i;
	while (m--) {
		int x;
		scanf("%d", &x);
		if (x >= 0 && x < 2)
			printf("y=%.1f\n", 2.5-x);
		else if (x >= 2 && x < 4)
			printf("y=%.1f\n", 2-1.5*(x-3)*(x-3));
		else if (x >= 4 && x < 6)
			printf("y=%.1f\n", (double)x/2-1.5);
	}
	return 0;
}