#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 n,a,g,s,b,q,s1=0; cin>>n; for(int i=1;i<=n;i++){ cin>>a; g=a%10; s=a%100/10; b=a%1000/100; q=a/1000; if(g-q-b-s>0) s1++; } cout<<s1; return 0; }