This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
int main()
{
int a, b;
scanf("%d %d", &a, &b);
if(a < 3 && b < 3)
{
printf("0");
return 0;
}
if(a < 3) a = 3;
if(b < 3) b = 3;
if(a % 2 == 1) a++;
if(b % 2 == 1) b--;
int answer;
if(((b - a) / 2 + 1) % 2 == 0) answer = (a + b) * ((b-a)/2+1) / 2;
else answer = a + (a+2 + b) * (b-a) / 4;
printf("%d", answer);
}
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