#include <bits/stdc++.h>
using namespace std;
 
vector<int>v={1,2,2,2,2,3,4,5,6,7};
int num = 2;
 
int main() {
	cout<<(lower_bound(v.begin(),v.end(),num)-v.begin() + upper_bound(v.begin(),v.end(),num)-v.begin()-1)/2<<endl;
	return 0;
}