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