#include<bits/stdc++.h> using namespace std; int main() { int n; int ge,shi,bai,qian; int m; cin>>m; int count =0; for(int i=1;i<=m;i++){ cin>>n; ge=n%10; shi=n%100/10; bai=n/100%10; qian=n/1000; if(ge-shi-bai-qian>0){ count++; } //TODO } cout<<count; return 0; }