#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_even = 0;
    void *cur = base;
    for(int i=1; i<num+1; i++){
        if(pred(cur) == 1){
            count_even++;
        }
        cur = base+i*size;
    }
    return count_even;
}

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

int pred_double(const void* a){
    double cur = *(double*) a;
    if ((((int)abs(cur)%2)==0) && ((fabs(cur) - abs((int)cur)) < 0.000001)) 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);
    }


    return 0;
}