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

int main(){
	int a[10],h,c = 0;
	int i;
	for(i = 0;i < 10;i++){
		cin>>a[i];
	} 
	
	cin>>h;
	
	for(i = 0;i < 10;i++){
		if(h + 30 >= a[i]){
			c++;
		}
	} 
	
	cout<<c<<endl;
	 
    return 0;
}

/**************************************************************
	Problem: 1388
	User: admin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/