# include<iostream> using namespace std; int main() { int n,a,G,S,B,Q,s=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-S-B-Q>0) s=s+1; } cout<<s; return 0; }