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