#include<iostream> using namespace std; int main(){ int a,b,c=0,d,e,f,g; cin>>a; for(int i=1;i<=a;i++){ cin>>b; g=b%10; f=b/10%10; e=b/100%10; d=b/1000%10; if(g-f-e-d>0){ c++; } } cout<<c<<endl; }