#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 i,j,s=0,a,G,S,B,Q; cin>>i; for(j=1;j<=i;j++){ cin>>a; G=a%10; S=a%100/10; B=a/100%10; Q=a/1000; if(G-S-B-Q > 0){ s++; } } cout<<s; return 0; }