#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
int t;
cin>>t;
while(t--){
int n,a,b;
cin>>a>>b>>n;
vector<int> arr(n);
for(int i=0;i<n;i++){
cin>>arr[i];
}
long long sum = b;
for(int i=0;i<n;i++){
if(arr[i] > a) sum += a-1;
else sum += arr[i];
}
cout<<sum<<"\n";
}
return 0;
}
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