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