#include<iostream>
#include<vector>
#include<algorithm>
#define pp pair<int,int>
using namespace std;
bool cmp(const pp &l,const pp &r)
{
	return l.first<r.first;
}
int main()
{
	vector<pp> v;
	v.push_back(pp(5,1));
	v.push_back(pp(4,2));
	v.push_back(pp(5,3));
	v.push_back(pp(2,4));
	sort(v.begin(),v.end(),cmp);
   int id=(int)(lower_bound(v.begin(),v.end(),pp(5,0),cmp)-v.begin());
   cout<<id<<endl;
}