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, aa, bb;
scanf("%d %d", &a, &b);
aa = (a-1)/2;
bb = (b+1)/2;
printf("%d", ((bb*(bb+1)/2)-(aa*(aa+1)/2))*2);
return 0;
}
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