#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,a,s=0,g,shi,b,q; cin>>i; for(i=1;i<=5;i++){ cin>>a; g=a%10; shi=a/100%10; b=a/100%100; q=a/1000; if(g-q-b-shi >0) s=s+1;} cout<<s; return 0; }