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