#include<vector>
#include<map>
#include<set>
#include<queue>
#include<algorithm>
#include<functional>
#include<numeric>
#include<utility>
#include<sstream>
#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cmath>
#include<cstdlib>
#include<cctype>
#include<string>
#include<cstring>
#include<list>
using namespace std;
typedef vector<int>VI;
typedef vector<VI>VVI;
typedef vector<string>VS;
typedef pair<int,int>PII;
typedef long long LL;
typedef pair<LL,LL>PLL;
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define PB push_back
#define EACH(i,c) for(typeof((c).begin())i=(c).begin();i!=(c).end();i++)
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define F first
#define S second


bool check(int S){
    for(int x=1;2*x*(x+1)<=S;x++){
        if((S-x)%(2*x+1)==0)return true;
    }
    return false;
}



int main(){
    int N;
    cin>>N;
    int cnt=0;
    while(N--){
        int S;
        cin>>S;
        if(!check(S))cnt++;
    }
    cout<<cnt<<endl;
}