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