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