#include<iostream>
using namespace std;
int main()
{
int n,x,g,s,b,q,t,z=0;
for (int i=1;i<=n;i++)
{
cin>>x;
q=x/1000;
x=x%1000;
b=x/100;
x=x%100;
s=x/10;
g=x%10;
t=g-q-b-s;
if (t>0) z++;
}
cout<<z<<endl;
return 0;
}
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