#include #include #include #include #include <string.h> #include #include <stdio.h> #include #include #include #define int long long using namespace std; const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int jian(int x) { int ge = x % 10; int shi = x % 100 / 10; int bai = x % 1000 / 100; int qian = x / 1000; if(ge - shi - bai - qian > 0) { return 0; } return -1; } signed main() { int n; cin >> n; int cnt = 0; for(int i = 1; i <= n; i++) { int a = 0; cin >> a; if(jian(a) == 0) { cnt++; } } printf("%lld\n", cnt); return 0; }