#include <stdio.h>
#define M 50
#include <math.h> 
int main() {
    int n;
    int stu[M][4];
    int count = 0; 
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < 3; j++) {
            scanf("%d", &stu[i][j]);
        }
    }
    for (int z = 0; z < n; z++) {
        stu[z][3] = stu[z][0] + stu[z][1] + stu[z][2];
    }
    for (int x = 0; x < n; x++) {
        for (int y = x + 1; y < n; y++) { 
            if (abs(stu[x][0] - stu[y][0]) <= 5 && abs(stu[x][1] - stu[y][1]) <= 5 &&
                abs(stu[x][2] - stu[y][2]) <= 5 && abs(stu[x][3] - stu[y][3]) <= 10) {
                count++; 
            }
        }
    }
    printf("%d", count); 
    return 0;
}