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