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);
a--;
if (a<3) a=3;
if (b<a) b=a;
if (a&1) a--;
if (b&1) b--;
a/=2, b/=2;
printf("%d\n",((b*(b+1)/2)-(a*(a+1)/2))*2);
}
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