#include <bits/stdc++.h>
using namespace std;
int a[11],x,ans;
int main(){
	for(int i = 1;i<=10;i++){
		scanf("%d",&a[i]);
		a[i]-=30;
	}
	scanf("%d",&x);
	for(int i = 1;i<=10;i++)
		if(a[i]<=x)ans++;
	printf("%d",ans);
	return 0;
}