#include "bits/stdc++.h"
using namespace std;

int main () {
	 ios::sync_with_stdio(false);
	 cin.tie(nullptr);
	 cout.tie(nullptr);
	 //~ set<int> st;
	 //~ st.insert(10);
	 //~ st.insert(20);
	 //~ st.insert(30);
	 //~ st.begin(),st.begin() + 1,st.begin() + 2, st.end()
	 //~ for (auto x : st) {
		 //~ cout << x << ' ';
	 //~ }
	 //~ cout << '\n';
	 //~ st.erase(21);
	 //~ for (auto x : st) {
		 //~ cout << x << ' ';
	 //~ }
	 //~ cout << '\n';
	 //~ auto it = st.find(20);
	 //~ if (it == st.end()) {
		 //~ //amra khuje painai
	 //~ } else {
		 //~ //amra paisi
	 //~ }
	 //0(n^2) => 100^2 => 1000
	 //O(n * n - 1)
	 //~ int n;
	 //~ cin >> n;
	 //~ vector<string> a;
	 //~ for (int i = 0; i < n; ++i) {
		 //~ string s;
		 //~ cin >> s;
		 //~ bool f = false;
		 //~ //0 + 1 + 2 + 3 + 4 + 5......
		 //~ //n => 0 + 1 + 2 + 3 + 4....n - 1 = n * (n - 1)
		 //~ for (int j = 0; j < (int) a.size(); ++j) {
			 //~ if (s == a[j]) {
				 //~ f = true;
				 //~ break;
			 //~ }
		 //~ }
		 //~ a.push_back(s);
		 //~ if (f == true) {
			 //~ cout << "YES\n";
		 //~ } else {
			 //~ cout << "NO\n";
		 //~ }
	 //~ }
	 //~ set<string> st;
	 //~ int n;
	 //~ cin >> n;
	 //~ for (int i = 0; i < n; ++i) {
		 //~ string s;
		 //~ cin >> s;
		 //~ if (st.find(s) == st.end()) {
			 //~ //painai
			 //~ cout << "NO\n";
		 //~ } else {
			 //~ //paisi
			 //~ cout << "YES\n";
		 //~ }
		 //~ st.insert(s);
	 //~ }
	 //~ set<int> st;
	 //~ int n;
	 //~ cin >> n;
	 //~ for (int i = 0; i < n - 1; ++i) {
		 //~ int x;
		 //~ cin >> x;
		 //~ st.insert(x);
	 //~ }
	 //~ for (int i = 1; i <= n; ++i) {
		 //~ if (st.find(i) == st.end()) {
			 //~ cout << i << '\n';
			 //~ return 0;
		 //~ }
	 //~ }
	 //upper_bound,lower_bound
	 //~ set<int> st;
	 //~ st.insert(10);
	 //~ st.insert(20);
	 //~ st.insert(30);
	 //~ int x = 10;
	 //~ auto it = st.upper_bound(x); //20
	 //~ auto it2 = st.lower_bound(x); //10
	 //~ cout << *it << '\n';
	 //~ cout << *it2 << '\n';
	 //~ multiset<int> st;
	 //~ st.insert(20);
	 //~ st.insert(10);
	 //~ st.insert(10);
	 //~ st.insert(10);
	 //~ for (auto x : st) {
		 //~ cout << x << ' ';
	 //~ }
	 //~ int x = 10;
	 //~ cout << st.count(x); //x koto bar ache st er moddhe
	 vector<int> a = {1,2,3,1,2,1,2,1,3,1,4,5};
	 int count[6];
	 for (int i = 0; i < 6; ++i) {
		 count[i] = 0;
	 }
	 //count[1] = 0 + 1 + 1, count[2] = 0 + 1,count[3] = 0 + 1,count[4] = 0,count[5] = 0
	 for (auto x : a) {
		 count[x]++;
	 }
	 cout << count[3] << '\n';
}