#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=0,m,g,sh,b,q; cin>>n; for(int i=1;i<=n;i++){ cin>>m; g=m%10; sh=m/10%10; b=m/100%10; q=m/1000; if(g-sh-b-q>0){ s++; } } cout<<s; }