#include<iostream> #include<cstring> #include<cmath> using namespace std; int main() { int n,a,sum=0; cin>>n; for(int i=1;i<=n;i++) { cin>>a; int ge=a%10; int shi=a/10%10; int bai=a/100%10; int qian=a/1000; if(ge-shi-bai-qian>0) sum++; } cout<<sum; return 0; }