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()
{
long long int a, b, ans, aa, bb;
scanf("%lld %lld", &a, &b);
if(b<3){
printf("0");
return 0;
}
if(a<3) a = 3;
aa = (a-1)/2;
bb = (b+1)/2;
ans = ((bb*(bb+1)/2)-(aa*(aa+1)/2))*2;
printf("%lld", ans);
}
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