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 a,b,c;
scanf ("%lld %lld",&a,&b);
a = (a + 1) / 2;
b = b / 2;
c = b * (b + 1) - a * (a - 1);
if (a == 1) c -= 2;
printf ("%lld",c);
return 0;
}
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