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>
#include<math.h>
int main()
{
long long a, b, sum;
scanf("%lld %lld",&a,&b);
if(b%2==1) b--;
if(b%2==0)
{
sum=b*(b+1)/2;
sum-=pow((b+1)/2,2);
}
printf("%lld",sum-2);
return 0;
}
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