import java.io.BufferedReader;
import java.io.InputStreamReader;
class Main
{
{
String[] params1
= bufferedReader.
readLine().
split(" "); String[] params2
= bufferedReader.
readLine().
split(" "); int n, k, t, v, hx, hy;
int s1, s2, s3, s4, m1, m2, m3, m4;
m1 = ((k + 1) % 4 >= 1) ? (k + 1) / 4 + 1 : (k + 1) / 4;
m2 = ((k + 1) % 4 >= 2) ? (k + 1) / 4 + 1 : (k + 1) / 4;
m3 = ((k + 1) % 4 >= 3) ? (k + 1) / 4 + 1 : (k + 1) / 4;
m4 = (k + 1) / 4;
s1 = (1 + (m1 - 1) * 2 * n) * m1;
s2 = (1 + n + 2 * n * (m2 - 1)) * m2;
s3 = (1 + 2 * n + 2 * n * (m3 - 1)) * m3;
s4 = (1 + 3 * n + 2 * n * (m4 - 1)) * m4;
int x = s1 + s2 - s3 - s4, y = s1 - s2 - s3 + s4;
if(t * t * v * v * 2 >= (x - hx) * (x - hx) + (y - hy) * (y - hy)){
System.
out.
print("Good night Ia"); } else {
}
}
}
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