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