#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

void readarr(int n, int *arr){
    for (int i = 0; i < n; i++){
        cin >> arr[i];
    }
}

void bub(int *arr, int n){
    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            if (arr[j] > arr[j + 1]){
                swap(arr[j], arr[j+1]);
            }
        }
    }
}

int raz(int n){
    int raz = 0;
    while (n != 0){
        raz++;
        n/=10;
    }
    return raz;
}

int *numtoarr(int n){
    int *tmp = new int[raz(n)];
    int i = 0;
    while (n!=0){
        tmp[i] = n%10;
        i++;
        n/=10;
    }
    return tmp;
}

int main(){
    int n, a;
    cin >> n;
    int arr[100] = {};
    readarr(n, arr);
    int res = 0;

    for (int i = 0; i < n; i++){
        int *num = numtoarr(arr[i]);
        int s = raz(arr[i]);
        for (int j = 0; j < s; j++){
            if (num[j] == num[j+3] && num[j+1] == num[j+2]  && num[j] != num[j+1] && num[j] != num[j+2]){
                res++;
                break;
            }
        }
        delete[]num;
    }
    cout << res;
}