// input code here

#include<iostream>
#include<cstdio>
using namespace std;
int f,ans,a[11];
int main()
{
    for(int i=1;i<=10;++i) cin>>a[i];
    cin>>f;
    for(int i=1;i<=10;++i)
        if(f+30>=a[i])
            ans++;
    cout<<ans<<endl;
    return 0;
}