#include <bits/stdc++.h>
#define endl '\n'
using namespace std;

int n, num;
int s[100]; 

string str = "01";

// 10进制转换成 2进制
string f(int n){
	if(n == 0) return "0";
	string re = "";
	while(n > 0){
		int g = n % 2;
		
		re = str[g] + re;
		
		n /= 2;
	} 
	return re;
} 


int main(){
	cin >> n;
	int maxx = 0; 
	for(int i = 1; i <= n; i++){
		cin >> num;
		string curr = f(num);
		int len = curr.size();
		int idx = 0;
		for(int j = len - 1; j >= 0; j--){
			char c = curr[j];
			if(c == '1'){
				s[idx]++;
			}
			idx++;
		}
		maxx = max(maxx, idx); // 统计最长字符串
//		cout << "当前这个数二进制是" << curr << "    " << idx << endl; 
	}
	
	int cnt = 0;
	for(int i = 0; i < maxx; i++){
		if(s[i] == n) {
			cnt++;
		}
	}
	cout << cnt;
	return 0;
}