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