#include<bits/stdc++.h>
using namespace std;
int main()
{
	int max=0,yes=0;
	int m[15];
	for(int i=0;i<10;i++)
	{
		cin>>m[i];
	}
	cin>>max;
	for(int i=0;i<10;i++)
	{
		if(max+30>=m[i])
		{
			yes+=1;
		}	
	} 
	cout<<yes;
	return 0;
}

/**************************************************************
	Problem: 1388
	User: lzc
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/