#include <iostream>
using namespace std;
int main() {
// your code goes here
int m,i,n,k,z,zz;
cin>>m;
for (i=1;i<=m;i++){
cin>>n;
cin>>k;
//z = n/k;
zz = n/k + n;
cout<<zz<<"\n";
}
return 0;
}
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