#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int g,s,b,q; int n,a; cin>>n; int c=0; for(int i=1;i<=n;i++){ cin>>a; g = a%10; s = a/10%10; b = a/100%10; q = a/1000; if(g-q-b-s>0){ c++; } } cout<<c; return 0; }