void setup() 
{
  Serial.begin(9600);
  Serial.println("Insert a number 0 - 100");
}
void loop() 
{
  if (Serial.available()) 
  {
    int n = Serial.parseInt();
    n = map(n, 0, 100, 1, 5);
    if (n == 1)
    Serial.println("RED");
     if (n == 2)
    Serial.println("BLUE");
     if (n == 3)
    Serial.println("GREEN");
     if (n == 4)
    Serial.println("WHITE");
    Serial.read();
  }
}