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