#include<bits/stdc++.h>
using namespace std;
int a[1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001];
int main(){
	for(int i=1;i<=10;i++){
		cin>>a[i];
	}
	int b,cnt=0;
	cin>>b;
	for(int i=1;i<=10;i++){
		if(b+30>=a[i]){
			cnt++;	
		}
		else{
			continue;
		}
	}
	cout<<cnt;
	return 0;
}