content: import java.io.*;
  import java.math.*;
  import java.security.*;
  import java.text.*;
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.regex.*;
  
  public class Solution {
  
    // Complete the taumBday function below.
    static String taumBday(int b, int w, int bc, int wc, int z) {
      BigInteger c = BigInteger.valueOf(b);
      BigInteger d = BigInteger.valueOf(Math.min(bc, wc + z));
      BigInteger e = BigInteger.valueOf(w);
      BigInteger f = BigInteger.valueOf(Math.min(wc, bc + z));
  
      return c.multiply(d).add(e.multiply(f)).toString();
    }
  
    private static final Scanner scanner = new Scanner(System.in);
  
    public static void main(String[] args) throws IOException {
      BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
  
      int t = scanner.nextInt();
      scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
      for (int tItr = 0; tItr < t; tItr++) {
        String[] bw = scanner.nextLine().split(" ");
  
        int b = Integer.parseInt(bw[0]);
  
        int w = Integer.parseInt(bw[1]);
  
        String[] bcWcz = scanner.nextLine().split(" ");
  
        int bc = Integer.parseInt(bcWcz[0]);
  
        int wc = Integer.parseInt(bcWcz[1]);
  
        int z = Integer.parseInt(bcWcz[2]);
  
        String result = taumBday(b, w, bc, wc, z);
  
        bufferedWriter.write(result);
        bufferedWriter.newLine();
      }
  
      bufferedWriter.close();
  
      scanner.close();
    }
  }
  