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