#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#define R register
using namespace std;
const int N=50;
int n,t,a[N],b[N],flag[N],ans,ton[N],tot;
inline void dfs(R int cnt,R int use){if(cnt>=ans)return;if(use==n){ans=min(ans,cnt);return;}R int lst=0;for(R int i=3;i<=14;++i){if(!ton[i])lst=0;else{++lst;if(lst>=5){for(R int k=i-lst+1;k<=i;++k)--ton[k];dfs(cnt+1,use+lst);for(R int k=i-lst+1;k<=i;++k)++ton[k];}}}lst=0;for(R int i=3;i<=14;++i){if(ton[i]<2)lst=0;else{++lst;if(lst>=3){for(R int k=i-lst+1;k<=i;++k)ton[k]-=2;dfs(cnt+1,use+lst*2);for(R int k=i-lst+1;k<=i;++k)ton[k]+=2;}}}lst=0;for(R int i=3;i<=14;i++){if(ton[i]<3)lst=0;else{++lst;if(lst>=2){for(R int k=i-lst+1;k<=i;++k)ton[k]-=3;dfs(cnt+1,use+lst*3);for(R int k=i-lst+1;k<=i;++k)ton[k]+=3;}}}for(R int i=3;i<=15;++i){if(ton[i]==4){ton[i]-=4;for(R int j=3;j<=15;++j){for(R int k=1;k<j;++k){if(ton[j]>=2&&ton[k]>=2){ton[j]-=2;ton[k]-=2;dfs(cnt+1,use+8);//四带二对ton[j]+=2;ton[k]+=2;}if(ton[j]>=1&&ton[k]>=1){--ton[j];--ton[k];dfs(cnt+1,use+6);//四带二单++ton[j];++ton[k];}}if(ton[j]>=2){ton[j]-=2;dfs(cnt+1,use+6);//四带二 同ton[j]+=2;}}ton[i]+=4;ton[i]-=4;dfs(cnt+1,use+4);//炸弹ton[i]+=4;}if(ton[i]>=3){ton[i]-=3;for(R int k=3;k<=15;++k){if(ton[k]&&i!=k){--ton[k];dfs(cnt+1,use+4);//三带一++ton[k];}if(ton[k]>=2){ton[k]-=2;dfs(cnt+1,use+5);//三带二ton[k]+=2;}}ton[i]+=3;ton[i]-=3;dfs(cnt+1,use+3);//三张ton[i]+=3;}}for(R int i=3;i<=15;++i)if(ton[i]>=1)++cnt;ans=min(ans,cnt);
}
int main(){scanf("%d%d",&t,&n);while(t--){ans=0x3f3f3f3f;memset(ton,0,sizeof(ton));for(R int i=1;i<=n;i++){scanf("%d%d",&a[i],&b[i]);if(a[i]==1)a[i]=14;if(a[i]==2)a[i]=15;if(a[i]==0)a[i]=16;ton[a[i]]++;}if(ton[16]){//火箭R int k=ton[16];ton[16]=0;dfs(1,k);}elsedfs(0,0);printf("%d\n",ans);}return 0;
}