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 n,m,i,t=0;
scanf("%lld %lld",&n,&m);
if(n%2==1)n++;
if(n==1||n==2)n=4;
if(m%2==1)m--;
if(n==m)printf("%d",n);
printf("%lld",(m-n+2)*(n+m)/4);
}
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