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