How about such approach:
int getSize(int v) {
int[] thresholds = {145, 117, 68, 51, 22, 10};
for (int i = 0; i < thresholds.length; i++) {
if (v > thresholds[i]) return i+1;
}
return 1;
}
Functionally: (Demonstrated in Scala)
def getSize(v: Int): Int = {
val thresholds = Vector(145, 117, 68, 51, 22, 10)
thresholds.zipWithIndex.find(v > _._1).map(_._2).getOrElse(0) + 1
}