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