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#include <iostream>
#include <fstream>
using namespace std;
int T,N,K,X,nr,ok=0;
ifstream f("divprim.in");
ofstream g("divprim.out");
int main()
{
f>>T;
for(int i=1;i<=T;i++)
{
f>>N;
f>>K;
X=N;
while(X>0 && ok==0)
{
nr=0;
if(X%2==0)
nr=nr+1;
for(int j=3;i<=N;j=j+2)
{
if(X%i==0)
nr=nr+1;
}
if(nr==K)
{g<<X<<endl;
ok=1;}
else
{X=X-1;
ok=0;}
}
if(X==0 && ok==0)
g<<"0";
}
return 0;
}