#include <iostream>
using namespace std;
int main() {
// your code goes here
int n,x,y,sum=0,c1=0,c2=0;
cin>>n>>x>>y;
int a[n],b[n];
for(int i=0;i<n;i++)
cin>>a[i];
for(int i=0;i<n;i++)
cin>>b[i];
for(int i=0;i<n;i++)
{
if(a[i]<=b[i]&&c1<=x)
{
a[i]=b[i];
sum+=a[i];
c1++;
}
else if(a[i]>=b[i]&&c2<=y)
{
a[i]=a[i];
sum+=a[i];
c2++;
}
if(x==0)
sum+=b[i];
if(y==0)
sum+=a[i];
}
cout<<sum;
return 0;
}
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