# include<iostream> using namespace std; int main(){ int q; cin>>q; int z; int n; int x=0; for(int j=1;j<=q;j++){ cin>>z; int ge=n%10; int shi=n/10%10; int bai=n/100%10; int qian=n/1000; if((ge-shi-bai-qian)>0) x++; } cout<<x; return 0; }