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()
{
unsigned long long a, b, sum;
scanf("%llu %llu",&a,&b);
if(a<2) a=2;
a/=2;
b/=2;
sum=b*(b+1);
sum-=a*(a+1);
printf("%llu",sum);
return 0;
}
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