#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;
}
/**************************************************************
	Problem: 1388
	User: huanghengyi
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/