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


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