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#include <iostream>
#include <fstream>
using namespace std;
int n,k,t,ok,d,p,x;
int promp(int x ,int div)
{
int p=0,d=2;
while(x!=1)
if(x%d==0)
{
p++;
if(p>d)
return 0;
while(x%d==0)
x/=d;
}
d++;
if(p==d)
return 1;
return 0;
}
int main()
{
ifstream f("divprim.in");
ofstream g("divprim.out");
int a[2][n];
for(int i=0;i<n;i++)
f>>a[1][i]>>a[2][i];
for(int i=0;i<n;i++)
{
int ok=1;
while(ok && a[1][i]>0)
{
if (promp( a[1][i],a[2][i]==0))
a[1][i]--;
else
ok=0;
}
g<<a[1][i]<<"\n";
}
return 0;
}