#8WA了,读到6而不是5
#include <bits/stdc++.h>
using namespace std;
const double eps=1e-10;
int f[(1<<18)+10],n,m,ok[20*20],tot;
double a,b,x[20],y[20];
void getab(double x1,double y1,double x2,double y2){
a=(y1*x2-y2*x1)/(x1*x2*(x1-x2));
b=((y1*x2*x2-y2*x1*x1)/(x1*x2*x2-x1*x1*x2));
}
double cal(double x){
return a*x*x+b*x;
}
void doit()
{
tot=0;memset(f,0x3f,sizeof(f));memset(ok,0,sizeof(ok));
f[0]=0;
scanf("%d%d",&n,&m);
for(int i=0;i<n;i++)scanf("%lf%lf",&x[i],&y[i]);
for(int i=0;i<n;i++)
for(int j=i;j<n;j++){
if(i==j){
ok[++tot]=(1<<i);
continue;
}
if(x[i]==x[j])continue;
getab(x[i],y[i],x[j],y[j]);
if(a>=-eps)continue;
tot++;
for(int k=0;k<n;k++){
if(fabs(cal(x[k])-y[k])<=eps)ok[tot]|=(1<<k);
}
}
for(int i=1;i<=tot;i++)
for(int j=0;j<(1<<n);j++)if((j&ok[i])==ok[i])f[j]=min(f[j],f[j-ok[i]]+1);
printf("%d\n",f[(1<<n)-1]);
}
int main()
{
int T;scanf("%d",&T);
while(T--)doit();
return 0;
}