#include <iostream>
using namespace std;
int main()
{
int A, B, s=0;
cin>>A>>B;
for(int i=0; i<=B; i++)
{
int x[i];
do{
x[i]=A;
s+=x[i+1];
}while (x[i]<=B);
}
cout<<s;
return 0;
}
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