import java.util.*;
import java.lang.*;
import java.io.*;
class Ideone
{
{
Scanner sc
= new Scanner
( System.
in ); int t = sc.nextInt();
while( t-- > 0 ){
int n = sc.nextInt(), k = sc.nextInt(), sum1 = 0, sum2 = 0, tmp;
while( n-- > 0){
tmp = sc.nextInt();
sum2 += (tmp>k)?k:tmp;
sum1 += tmp;
}
System.
out.
println(sum1
-sum2
); }
}
}
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