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, x = 0, y = 0;
for (int i = 0; i <= k; ++i){
if(i%4 == 0){
x += 1 + n*i;
y += 1 + n*i;
} else if (i%4 == 1){
x += 1 + n*i;
y -= 1 + n*i;
} else if(i%4 == 2){
x -= 1 + n*i;
y -= 1 + n*i;
} else if(i%4 == 3){
x -= 1 + n*i;
y += 1 + n*i;
}
}
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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