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==1||n==2)n==3;
    if(n%2==1)n++;
    if(n==m){printf("%d",n);return 0;}
    t=m-n;
    t/=2;
    t*=(n+m);
    printf("%lld",(m-n)/2*(n+m));
    return 0;
}
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