#include <stdio.h>

int main(int argc, char **argv) {

  int A,B;
  int sum=0;

  printf("A = ");
  scanf("%d",&A);
  printf("B = ");
  scanf("%d",&B);

  for(int x=A; x<=B; x++) {
    if(x <= 0) continue;
    if(x % 4 == 0) sum += x;
  }

  printf("%d\n",sum);
  return 0;
}