#include <iostream>
using namespace std;
int n,j,g,s,b,q,m;
int main()
{
    cin>>n;
    for(int i=0;i<=n;++i)
    {
        cin>>j;
        g=j%10;
        s=j/10%10;
        b=j/100%10;
        q=j/1000;
        if(g-q-b-s>0)
        {
            m+=1;
        }
    }
    cout<<m;
    


    return 0;
}