noname54

#include<bits/stdc++.h>


using namespace std;


    /* ----------------- ~~~~~~~ ----------------- */

    long long x, d;

/* ----------------- ~~~~~~~ ----------------- */

int main(){

    freopen("sn.txt", "r", stdin);
    freopen("kq.txt", "w", stdout);
    ios_base::sync_with_stdio(0); cin.tie(0);

        /* ----------------- main func ----------------- */

    while(cin >> x)
        d += !(x&1);
    cout << d;

/* ----------------- ~~~~~~~~~ ----------------- */

}