#include<iostream>
#include<cmath>
using namespace std;
bool isans(int ac,int am,int ae,int bc,int bm,int be){
    int a=ac+ae+am;
    int b=bc+be+bm;
    int aa[4];
    int bb[4];
    aa[1]=ac;
    aa[2]=ae;
    aa[3]=am;
    bb[1]=bc;
    bb[2]=bm;
    bb[3]=be;
    for(int j=1;j<=3;j++){
        for(int k=1;k<=3;k++){
            if(abs(aa[j]-bb[k])>5) return false;
        }
    }
    if(abs(a-b)>10) return false;
    return true;
}
int main(){
    int n,ans=0;
    cin>>n;
    int chinese[n+10];
    int math[n+10];
    int english[n+10];
    for(int i=1;i<=n;i++) cin>>chinese[i]>>math[i]>>english[i];
    for(int j=1;j<=n;j++){
        for(int k=1;k<=n;k++){
            if(isans(chinese[j],math[j],english[j],chinese[k],math[k],english[k])==true) ans++;
        }
    }
    cout<<ans;
}