# include<iomanip> # include<iostream> using namespace std; int main(){ int n,cnt=0; int a,q,b,s,g; scanf("%d",&n); for(int i=1;i<=n;i++){ scanf("%d",&a); q=a/1000%10; b=a/100%10; s=a/10%10; g=a%10; if(g-q-b-s>0){ cnt++; } } printf("%d",cnt); return 0; }