#include<stdio.h>
int main()
{
    int N,a[1001][3],i,j,count=0,k;
    int sum[1001]={0};
    scanf("%d/n",&N);
    for(i=0;i<N;i++){
        for(j=0;j<3;j++){
            scanf("%d",&a[i][j]);
            sum[i]+=a[i][j];//计算每位同学的总成绩
        }}
    for(i=0;i<N;i++){
        for(k=i+1;k<N;k++){
                for(j=0;j<3;j++){
                    if((a[i][j]-a[k][j])<=5&&-5<=(a[i][j]-a[k][j]))
                        continue;
                    else if(j==2)
                        {if(-10<=(sum[i]-sum[k])&&(sum[i]-sum[k])<=10)
                            {count+=1;}}
                    else
                        break;}}}
    printf("%d",count);
    return 0;
}