#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int count_if(void *base, size_t num, size_t size, int(*pred)(const void *)) {
    int count = 0;
    void *elem = base;
    for (int i = 1; i < num + 1; i++) {
        if (pred(elem) == 1)
            count++;
        elem = base + i * size;
    }
    return count;
}

int pred_int(const void *base){
    int elem = *(int*)base;
    if(abs(elem)%2==0)
        return 1;
    return 0;
}

int pred_double(const void *base) {
    double elem = *(double *) base;
    if (((int)abs(elem) % 2 == 0) && (((fabs(elem) - abs((int) elem))) < 0.0000001)) {
        return 1;
    }
    return 0;
}

int main(){
    int n = 20;
    int size = 0;
    scanf("%d", &size);
    if (size==4){
        int input_array[n];
        for(int i = 0; i<n; i++)
            scanf("%d", &input_array[i]);
        int p = count_if(input_array, n, sizeof(int), pred_int);
        printf("%d", p);
    }
    if (size==8){
        double input_array[n];
        for(int i = 0; i<n; i++)
            scanf("%lf", &input_array[i]);
        int p = count_if(input_array, n, sizeof(double), pred_double);
        printf("%d", p);
    }
}