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