include<iostream>
include<cmath>
using namespace std;
int main()
{
long long n, b,y;
cin >> y;
while(y--)
{
cin >> n >> b;
for (long long i = 0; i <= 9973; i++)
{
if (((b*i) - n) % 9973 == 0)
{
cout << i<<endl; break;
}
}
}
}
using namespace std;
int main()
{
long long n, b,y;
cin >> y;
while(y--)
{
cin >> n >> b;
for (long long i = 0; i <= 9973; i++)
{
if (((b*i) - n) % 9973 == 0)
{
cout << i<<endl; break;
}
}
}
}