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