// 이 별은 무슨 색일까
package Bronze_V_5;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Ex30676 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
int wavelength = Integer.parseInt(br.readLine());
if (620 <= wavelength && wavelength <= 780) {
System.out.println("Red");
} else if (590 <= wavelength && wavelength < 620) {
System.out.println("Orange");
} else if (570 <= wavelength && wavelength < 590) {
System.out.println("Yellow");
} else if (495 <= wavelength && wavelength < 570) {
System.out.println("Green");
} else if (450 <= wavelength && wavelength < 495) {
System.out.println("Blue");
} else if (425 <= wavelength && wavelength < 450) {
System.out.println("Indigo");
} else if (380 <= wavelength && wavelength < 425) {
System.out.println("Violet");
}
}
}