Untitled

import java.util.Scanner;

public class SumOddOrEvenNumbers {
   public static void main(String[] args) {
      Scanner scnr = new Scanner(System.in);

      //input values
      int low, high, x;
      low = scnr.nextInt();
      high = scnr.nextInt();
      x= scnr.nextInt();
      int i;
      int result = 0;
      
      
      if (x!=1 && x!=2) {
         System.out.println("Invalid");
      }
      //checking if x is 1 to add odd values
      if (x==1){
         
         //while (result<=high) {
            for (i=low; i<=high; ++i) {
               if (i%2!=0){
                  result= result+i;
               }
            }
            System.out.println(result);
         
         
         
      }
      //checking if x is 2 to add odd values
      else if (x==2){
         
         //while (result<=high) {
            for (i=low; i<=high; ++i) {
               if (i%2==0){
                  result= result+i;
               }
            }
            System.out.println(result);
         
         
         
      }
      
   }
}