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#include <iostream>
using namespace std;
int getSum(int lef, int rig)
{
return (lef<=rig) ? ((lef%2==0) ? (getSum(lef+1, rig)+lef) : getSum(lef+1, rig)) : 0;
}
int main()
{
int m = 0;
int n = 0;
cin>>m>>n;
int sum = 0;
sum = getSum(n, m);
cout<<sum<<endl;
return 0;
}