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

/**************************************************************
	Problem: 1388
	User: zzz
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/